iOS Simulator hot reload doesn't work with iOS 11 and XCode 9

Steps to Reproduce
Install XCode 9 beta (in particular beta 6 build 9M214v).
Start simulator (using iPhone 7)
run Flutter app (i.e. flutter run -d iPhone)
It never gets to the point where it shows commands for hot reload etc.
It also seems that after running in intellij, the hot reload button never becomes enabled. It shows some 'unnown key for Boolean:'... type messages and then "Observatory connection never becomes ready."
(added: before I installed xcode 9 beta I was having no problem with flutter running)
Logs
This is the output of flutter run:
[  +33 ms] [/Users/morgan/flutter/] git rev-parse --abbrev-ref --symbolic @{u}
[  +43 ms] Exit code 0 from: git rev-parse --abbrev-ref --symbolic @{u}
[        ] origin/alpha
[        ] [/Users/morgan/flutter/] git ls-remote --get-url origin
[  +15 ms] Exit code 0 from: git ls-remote --get-url origin
[        ] https://github.com/flutter/flutter.git
[        ] [/Users/morgan/flutter/] git log -n 1 --pretty=format:%H
[  +21 ms] Exit code 0 from: git log -n 1 --pretty=format:%H
[        ] 1c372c6803495a488ac894dc6be8990412eb34b1
[        ] [/Users/morgan/flutter/] git log -n 1 --pretty=format:%ar
[  +11 ms] Exit code 0 from: git log -n 1 --pretty=format:%ar
[        ] 5 days ago
[ +186 ms] /usr/bin/defaults read /Applications/Android Studio.app/Contents/Info CFBundleShortVersionString
[  +41 ms] Exit code 0 from: /usr/bin/defaults read /Applications/Android Studio.app/Contents/Info CFBundleShortVersionString
[        ] 2.3
[ +151 ms] Listing devices using /Users/morgan/Library/Android/sdk/platform-tools/adb
[        ] /Users/morgan/Library/Android/sdk/platform-tools/adb devices -l
[  +22 ms] Exit code 0 from: /Users/morgan/Library/Android/sdk/platform-tools/adb devices -l
[        ] List of devices attached
           emulator-5554          device product:sdk_gphone_x86 model:Android_SDK_built_for_x86 device:generic_x86
[+2639 ms] /usr/bin/xcrun simctl list --json devices
[+1439 ms] Launching lib/main.dart on iPhone 7 in debug mode...
[   +2 ms] /usr/bin/defaults read /Users/morgan/Programming/temp/myapp/ios/Runner/Info CFBundleIdentifier
[  +54 ms] Exit code 0 from: /usr/bin/defaults read /Users/morgan/Programming/temp/myapp/ios/Runner/Info CFBundleIdentifier
[        ] $(PRODUCT_BUNDLE_IDENTIFIER)
[        ] /usr/bin/xcodebuild -project /Users/morgan/Programming/temp/myapp/ios/Runner.xcodeproj -target Runner -showBuildSettings
[+2158 ms] Exit code 0 from: /usr/bin/xcodebuild -project /Users/morgan/Programming/temp/myapp/ios/Runner.xcodeproj -target Runner -showBuildSettings
[        ] Build settings for action build and target Runner:
               ACTION = build
               AD_HOC_CODE_SIGNING_ALLOWED = NO
               ALTERNATE_GROUP = staff
               ALTERNATE_MODE = u+w,go-w,a+rX
               ALTERNATE_OWNER = morgan
               ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES = NO
               ALWAYS_SEARCH_USER_PATHS = NO
               ALWAYS_USE_SEPARATE_HEADERMAPS = NO
               APPLE_INTERNAL_DEVELOPER_DIR = /AppleInternal/Developer
               APPLE_INTERNAL_DIR = /AppleInternal
               APPLE_INTERNAL_DOCUMENTATION_DIR = /AppleInternal/Documentation
               APPLE_INTERNAL_LIBRARY_DIR = /AppleInternal/Library
               APPLE_INTERNAL_TOOLS = /AppleInternal/Developer/Tools
               APPLICATION_EXTENSION_API_ONLY = NO
               APPLY_RULES_IN_COPY_FILES = NO
               ARCHS = arm64
               ARCHS_STANDARD = armv7 arm64
               ARCHS_STANDARD_32_64_BIT = armv7 arm64
               ARCHS_STANDARD_32_BIT = armv7
               ARCHS_STANDARD_64_BIT = arm64
               ARCHS_STANDARD_INCLUDING_64_BIT = armv7 arm64
               ARCHS_UNIVERSAL_IPHONE_OS = armv7 arm64
               ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon
               AVAILABLE_PLATFORMS = appletvos appletvsimulator iphoneos iphonesimulator macosx watchos watchsimulator
               BITCODE_GENERATION_MODE = marker
               BUILD_ACTIVE_RESOURCES_ONLY = NO
               BUILD_COMPONENTS = headers build
               BUILD_DIR = /Users/morgan/Programming/temp/myapp/build/ios
               BUILD_ROOT = /Users/morgan/Programming/temp/myapp/build/ios
               BUILD_STYLE =
               BUILD_VARIANTS = normal
               BUILT_PRODUCTS_DIR = /Users/morgan/Programming/temp/myapp/build/ios/Release-iphoneos
               CACHE_ROOT = /var/folders/8_/f5y7_bd549v6tr5rcthpdtp40000gn/C/com.apple.DeveloperTools/9.0-9M214v/Xcode
               CCHROOT = /var/folders/8_/f5y7_bd549v6tr5rcthpdtp40000gn/C/com.apple.DeveloperTools/9.0-9M214v/Xcode
               CHMOD = /bin/chmod
               CHOWN = /usr/sbin/chown
               CLANG_ANALYZER_NONNULL = YES
               CLANG_CXX_LANGUAGE_STANDARD = gnu++0x
               CLANG_CXX_LIBRARY = libc++
               CLANG_ENABLE_MODULES = YES
               CLANG_ENABLE_OBJC_ARC = YES
               CLANG_WARN_BOOL_CONVERSION = YES
               CLANG_WARN_CONSTANT_CONVERSION = YES
               CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR
               CLANG_WARN_EMPTY_BODY = YES
               CLANG_WARN_ENUM_CONVERSION = YES
               CLANG_WARN_INFINITE_RECURSION = YES
               CLANG_WARN_INT_CONVERSION = YES
               CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR
               CLANG_WARN_SUSPICIOUS_MOVE = YES
               CLANG_WARN_UNREACHABLE_CODE = YES
               CLANG_WARN__DUPLICATE_METHOD_MATCH = YES
               CLASS_FILE_DIR = /Users/morgan/Programming/temp/myapp/build/ios/Runner.build/Release-iphoneos/Runner.build/JavaClasses
               CLEAN_PRECOMPS = YES
               CLONE_HEADERS = NO
               CODESIGNING_FOLDER_PATH = /Users/morgan/Programming/temp/myapp/build/ios/Release-iphoneos/Runner.app
               CODE_SIGNING_ALLOWED = YES
               CODE_SIGNING_REQUIRED = YES
               CODE_SIGN_CONTEXT_CLASS = XCiPhoneOSCodeSignContext
               CODE_SIGN_IDENTITY = iPhone Developer
               COLOR_DIAGNOSTICS = NO
               COMBINE_HIDPI_IMAGES = NO
               COMPILER_INDEX_STORE_ENABLE = Default
               COMPOSITE_SDK_DIRS = /Users/morgan/Programming/temp/myapp/build/ios/CompositeSDKs
               COMPRESS_PNG_FILES = YES
               CONFIGURATION = Release
               CONFIGURATION_BUILD_DIR = /Users/morgan/Programming/temp/myapp/build/ios/Release-iphoneos
               CONFIGURATION_TEMP_DIR = /Users/morgan/Programming/temp/myapp/build/ios/Runner.build/Release-iphoneos
               CONTENTS_FOLDER_PATH = Runner.app
               COPYING_PRESERVES_HFS_DATA = NO
               COPY_HEADERS_RUN_UNIFDEF = NO
               COPY_PHASE_STRIP = NO
               COPY_RESOURCES_FROM_STATIC_FRAMEWORKS = YES
               CORRESPONDING_SIMULATOR_PLATFORM_DIR = /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneSimulator.platform
               CORRESPONDING_SIMULATOR_PLATFORM_NAME = iphonesimulator
               CORRESPONDING_SIMULATOR_SDK_DIR = /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator11.0.sdk
               CORRESPONDING_SIMULATOR_SDK_NAME = iphonesimulator11.0
               CP = /bin/cp
               CREATE_INFOPLIST_SECTION_IN_BINARY = NO
               CURRENT_ARCH = arm64
               CURRENT_VARIANT = normal
               DEAD_CODE_STRIPPING = YES
               DEBUGGING_SYMBOLS = YES
               DEBUG_INFORMATION_FORMAT = dwarf-with-dsym
               DEFAULT_COMPILER = com.apple.compilers.llvm.clang.1_0
               DEFAULT_KEXT_INSTALL_PATH = /System/Library/Extensions
               DEFINES_MODULE = NO
               DEPLOYMENT_LOCATION = NO
               DEPLOYMENT_POSTPROCESSING = NO
               DEPLOYMENT_TARGET_CLANG_ENV_NAME = IPHONEOS_DEPLOYMENT_TARGET
               DEPLOYMENT_TARGET_CLANG_FLAG_NAME = miphoneos-version-min
               DEPLOYMENT_TARGET_CLANG_FLAG_PREFIX = -miphoneos-version-min=
               DEPLOYMENT_TARGET_SETTING_NAME = IPHONEOS_DEPLOYMENT_TARGET
               DEPLOYMENT_TARGET_SUGGESTED_VALUES = 8.0 8.1 8.2 8.3 8.4 9.0 9.1 9.2 9.3 10.0 10.1 10.2 10.3 11.0
               DERIVED_FILES_DIR = /Users/morgan/Programming/temp/myapp/build/ios/Runner.build/Release-iphoneos/Runner.build/DerivedSources
               DERIVED_FILE_DIR = /Users/morgan/Programming/temp/myapp/build/ios/Runner.build/Release-iphoneos/Runner.build/DerivedSources
               DERIVED_SOURCES_DIR = /Users/morgan/Programming/temp/myapp/build/ios/Runner.build/Release-iphoneos/Runner.build/DerivedSources
               DEVELOPER_APPLICATIONS_DIR = /Applications/Xcode-beta.app/Contents/Developer/Applications
               DEVELOPER_BIN_DIR = /Applications/Xcode-beta.app/Contents/Developer/usr/bin
               DEVELOPER_DIR = /Applications/Xcode-beta.app/Contents/Developer
               DEVELOPER_FRAMEWORKS_DIR = /Applications/Xcode-beta.app/Contents/Developer/Library/Frameworks
               DEVELOPER_FRAMEWORKS_DIR_QUOTED = /Applications/Xcode-beta.app/Contents/Developer/Library/Frameworks
               DEVELOPER_LIBRARY_DIR = /Applications/Xcode-beta.app/Contents/Developer/Library
               DEVELOPER_SDK_DIR = /Applications/Xcode-beta.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs
               DEVELOPER_TOOLS_DIR = /Applications/Xcode-beta.app/Contents/Developer/Tools
               DEVELOPER_USR_DIR = /Applications/Xcode-beta.app/Contents/Developer/usr
               DEVELOPMENT_LANGUAGE = English
               DOCUMENTATION_FOLDER_PATH = Runner.app/English.lproj/Documentation
               DO_HEADER_SCANNING_IN_JAM = NO
               DSTROOT = /tmp/Runner.dst
               DT_TOOLCHAIN_DIR = /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain
               DWARF_DSYM_FILE_NAME = Runner.app.dSYM
               DWARF_DSYM_FILE_SHOULD_ACCOMPANY_PRODUCT = NO
               DWARF_DSYM_FOLDER_PATH = /Users/morgan/Programming/temp/myapp/build/ios/Release-iphoneos
               EFFECTIVE_PLATFORM_NAME = -iphoneos
               EMBEDDED_CONTENT_CONTAINS_SWIFT = NO
               EMBEDDED_PROFILE_NAME = embedded.mobileprovision
               EMBED_ASSET_PACKS_IN_PRODUCT_BUNDLE = NO
               ENABLE_BITCODE = NO
               ENABLE_DEFAULT_HEADER_SEARCH_PATHS = YES
               ENABLE_HEADER_DEPENDENCIES = YES
               ENABLE_NS_ASSERTIONS = NO
               ENABLE_ON_DEMAND_RESOURCES = YES
               ENABLE_STRICT_OBJC_MSGSEND = YES
               ENABLE_TESTABILITY = NO
               ENTITLEMENTS_ALLOWED = YES
               ENTITLEMENTS_REQUIRED = YES
               EXCLUDED_INSTALLSRC_SUBDIRECTORY_PATTERNS = .DS_Store .svn .git .hg CVS
               EXCLUDED_RECURSIVE_SEARCH_PATH_SUBDIRECTORIES = *.nib *.lproj *.framework *.gch *.xcode* *.xcassets (*) .DS_Store CVS .svn .git .hg *.pbproj *.pbxproj
               EXECUTABLES_FOLDER_PATH = Runner.app/Executables
               EXECUTABLE_FOLDER_PATH = Runner.app
               EXECUTABLE_NAME = Runner
               EXECUTABLE_PATH = Runner.app/Runner
               EXPANDED_CODE_SIGN_IDENTITY =
               EXPANDED_CODE_SIGN_IDENTITY_NAME =
               EXPANDED_PROVISIONING_PROFILE =
               FILE_LIST = /Users/morgan/Programming/temp/myapp/build/ios/Runner.build/Release-iphoneos/Runner.build/Objects/LinkFileList
               FIXED_FILES_DIR = /Users/morgan/Programming/temp/myapp/build/ios/Runner.build/Release-iphoneos/Runner.build/FixedFiles
               FLUTTER_APPLICATION_PATH = /Users/morgan/Programming/temp/myapp
               FLUTTER_BUILD_DIR = build
               FLUTTER_BUILD_MODE = debug
               FLUTTER_FRAMEWORK_DIR = /Users/morgan/flutter/bin/cache/artifacts/engine/ios
               FLUTTER_ROOT = /Users/morgan/flutter
               FLUTTER_TARGET = lib/main.dart
               FRAMEWORKS_FOLDER_PATH = Runner.app/Frameworks
               FRAMEWORK_FLAG_PREFIX = -framework
               FRAMEWORK_SEARCH_PATHS =  /Users/morgan/Programming/temp/myapp/ios/Flutter
               FRAMEWORK_VERSION = A
               FULL_PRODUCT_NAME = Runner.app
               GCC3_VERSION = 3.3
               GCC_C_LANGUAGE_STANDARD = gnu99
               GCC_INLINES_ARE_PRIVATE_EXTERN = YES
               GCC_NO_COMMON_BLOCKS = YES
               GCC_PFE_FILE_C_DIALECTS = c objective-c c++ objective-c++
               GCC_SYMBOLS_PRIVATE_EXTERN = YES
               GCC_THUMB_SUPPORT = YES
               GCC_TREAT_WARNINGS_AS_ERRORS = NO
               GCC_VERSION = com.apple.compilers.llvm.clang.1_0
               GCC_VERSION_IDENTIFIER = com_apple_compilers_llvm_clang_1_0
               GCC_WARN_64_TO_32_BIT_CONVERSION = YES
               GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR
               GCC_WARN_UNDECLARED_SELECTOR = YES
               GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE
               GCC_WARN_UNUSED_FUNCTION = YES
               GCC_WARN_UNUSED_VARIABLE = YES
               GENERATE_MASTER_OBJECT_FILE = NO
               GENERATE_PKGINFO_FILE = YES
               GENERATE_PROFILING_CODE = NO
               GENERATE_TEXT_BASED_STUBS = NO
               GID = 20
               GROUP = staff
               HEADERMAP_INCLUDES_FLAT_ENTRIES_FOR_TARGET_BEING_BUILT = YES
               HEADERMAP_INCLUDES_FRAMEWORK_ENTRIES_FOR_ALL_PRODUCT_TYPES = YES
               HEADERMAP_INCLUDES_NONPUBLIC_NONPRIVATE_HEADERS = YES
               HEADERMAP_INCLUDES_PROJECT_HEADERS = YES
               HEADERMAP_USES_FRAMEWORK_PREFIX_ENTRIES = YES
               HEADERMAP_USES_VFS = NO
               HIDE_BITCODE_SYMBOLS = YES
               HOME = /Users/morgan
               ICONV = /usr/bin/iconv
               INFOPLIST_EXPAND_BUILD_SETTINGS = YES
               INFOPLIST_FILE = Runner/Info.plist
               INFOPLIST_OUTPUT_FORMAT = binary
               INFOPLIST_PATH = Runner.app/Info.plist
               INFOPLIST_PREPROCESS = NO
               INFOSTRINGS_PATH = Runner.app/English.lproj/InfoPlist.strings
               INLINE_PRIVATE_FRAMEWORKS = NO
               INSTALLHDRS_COPY_PHASE = NO
               INSTALLHDRS_SCRIPT_PHASE = NO
               INSTALL_DIR = /tmp/Runner.dst/Applications
               INSTALL_GROUP = staff
               INSTALL_MODE_FLAG = u+w,go-w,a+rX
               INSTALL_OWNER = morgan
               INSTALL_PATH = /Applications
               INSTALL_ROOT = /tmp/Runner.dst
               IPHONEOS_DEPLOYMENT_TARGET = 8.0
               JAVAC_DEFAULT_FLAGS = -J-Xms64m -J-XX:NewSize=4M -J-Dfile.encoding=UTF8
               JAVA_APP_STUB = /System/Library/Frameworks/JavaVM.framework/Resources/MacOS/JavaApplicationStub
               JAVA_ARCHIVE_CLASSES = YES
               JAVA_ARCHIVE_TYPE = JAR
               JAVA_COMPILER = /usr/bin/javac
               JAVA_FOLDER_PATH = Runner.app/Java
               JAVA_FRAMEWORK_RESOURCES_DIRS = Resources
               JAVA_JAR_FLAGS = cv
               JAVA_SOURCE_SUBDIR = .
               JAVA_USE_DEPENDENCIES = YES
               JAVA_ZIP_FLAGS = -urg
               JIKES_DEFAULT_FLAGS = +E +OLDCSO
               KASAN_DEFAULT_CFLAGS = -DKASAN=1 -fsanitize=address -mllvm -asan-globals-live-support -mllvm -asan-force-dynamic-shadow
               KEEP_PRIVATE_EXTERNS = NO
               LD_DEPENDENCY_INFO_FILE = /Users/morgan/Programming/temp/myapp/build/ios/Runner.build/Release-iphoneos/Runner.build/Objects-normal/arm64/Runner_dependency_info.dat
               LD_GENERATE_MAP_FILE = NO
               LD_MAP_FILE_PATH = /Users/morgan/Programming/temp/myapp/build/ios/Runner.build/Release-iphoneos/Runner.build/Runner-LinkMap-normal-arm64.txt
               LD_NO_PIE = NO
               LD_QUOTE_LINKER_ARGUMENTS_FOR_COMPILER_DRIVER = YES
               LD_RUNPATH_SEARCH_PATHS =  @executable_path/Frameworks
               LEGACY_DEVELOPER_DIR = /Applications/Xcode-beta.app/Contents/PlugIns/Xcode3Core.ideplugin/Contents/SharedSupport/Developer
               LEX = lex
               LIBRARY_FLAG_NOSPACE = YES
               LIBRARY_FLAG_PREFIX = -l
               LIBRARY_KEXT_INSTALL_PATH = /Library/Extensions
               LIBRARY_SEARCH_PATHS =  /Users/morgan/Programming/temp/myapp/ios/Flutter
               LINKER_DISPLAYS_MANGLED_NAMES = NO
               LINK_FILE_LIST_normal_arm64 =
               LINK_WITH_STANDARD_LIBRARIES = YES
               LOCALIZABLE_CONTENT_DIR =
               LOCALIZED_RESOURCES_FOLDER_PATH = Runner.app/English.lproj
               LOCAL_ADMIN_APPS_DIR = /Applications/Utilities
               LOCAL_APPS_DIR = /Applications
               LOCAL_DEVELOPER_DIR = /Library/Developer
               LOCAL_LIBRARY_DIR = /Library
               LOCROOT =
               LOCSYMROOT =
               MACH_O_TYPE = mh_execute
               MAC_OS_X_PRODUCT_BUILD_VERSION = 16G29
               MAC_OS_X_VERSION_ACTUAL = 101206
               MAC_OS_X_VERSION_MAJOR = 101200
               MAC_OS_X_VERSION_MINOR = 1206
               METAL_LIBRARY_FILE_BASE = default
               METAL_LIBRARY_OUTPUT_DIR = /Users/morgan/Programming/temp/myapp/build/ios/Release-iphoneos/Runner.app
               MODULE_CACHE_DIR = /Users/morgan/Library/Developer/Xcode/DerivedData/ModuleCache
               MTL_ENABLE_DEBUG_INFO = NO
               NATIVE_ARCH = armv7
               NATIVE_ARCH_32_BIT = i386
               NATIVE_ARCH_64_BIT = x86_64
               NATIVE_ARCH_ACTUAL = x86_64
               NO_COMMON = YES
               OBJECT_FILE_DIR = /Users/morgan/Programming/temp/myapp/build/ios/Runner.build/Release-iphoneos/Runner.build/Objects
               OBJECT_FILE_DIR_normal = /Users/morgan/Programming/temp/myapp/build/ios/Runner.build/Release-iphoneos/Runner.build/Objects-normal
               OBJROOT = /Users/morgan/Programming/temp/myapp/build/ios
               ONLY_ACTIVE_ARCH = NO
               OS = MACOS
               OSAC = /usr/bin/osacompile
               PACKAGE_TYPE = com.apple.package-type.wrapper.application
               PASCAL_STRINGS = YES
               PATH = /Applications/Xcode-beta.app/Contents/Developer/usr/bin:/Users/morgan/flutter/bin:/Users/morgan/flutter.bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin
               PATH_PREFIXES_EXCLUDED_FROM_HEADER_DEPENDENCIES = /usr/include /usr/local/include /System/Library/Frameworks /System/Library/PrivateFrameworks /Applications/Xcode-beta.app/Contents/Developer/Headers /Applications/Xcode-beta.app/Contents/Developer/SDKs /Applications/Xcode-beta.app/Contents/Developer/Platforms
               PBDEVELOPMENTPLIST_PATH = Runner.app/pbdevelopment.plist
               PFE_FILE_C_DIALECTS = objective-c
               PKGINFO_FILE_PATH = /Users/morgan/Programming/temp/myapp/build/ios/Runner.build/Release-iphoneos/Runner.build/PkgInfo
               PKGINFO_PATH = Runner.app/PkgInfo
               PLATFORM_DEVELOPER_APPLICATIONS_DIR = /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/Applications
               PLATFORM_DEVELOPER_BIN_DIR = /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin
               PLATFORM_DEVELOPER_LIBRARY_DIR = /Applications/Xcode-beta.app/Contents/PlugIns/Xcode3Core.ideplugin/Contents/SharedSupport/Developer/Library
               PLATFORM_DEVELOPER_SDK_DIR = /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs
               PLATFORM_DEVELOPER_TOOLS_DIR = /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/Tools
               PLATFORM_DEVELOPER_USR_DIR = /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr
               PLATFORM_DIR = /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform
               PLATFORM_DISPLAY_NAME = iOS
               PLATFORM_NAME = iphoneos
               PLATFORM_PREFERRED_ARCH = arm64
               PLATFORM_PRODUCT_BUILD_VERSION = 15A5361a
               PLIST_FILE_OUTPUT_FORMAT = binary
               PLUGINS_FOLDER_PATH = Runner.app/PlugIns
               PRECOMPS_INCLUDE_HEADERS_FROM_BUILT_PRODUCTS_DIR = YES
               PRECOMP_DESTINATION_DIR = /Users/morgan/Programming/temp/myapp/build/ios/Runner.build/Release-iphoneos/Runner.build/PrefixHeaders
               PRESERVE_DEAD_CODE_INITS_AND_TERMS = NO
               PRIVATE_HEADERS_FOLDER_PATH = Runner.app/PrivateHeaders
               PRODUCT_BUNDLE_IDENTIFIER = com.yourcompany.myapp
               PRODUCT_MODULE_NAME = Runner
               PRODUCT_NAME = Runner
               PRODUCT_SETTINGS_PATH = /Users/morgan/Programming/temp/myapp/ios/Runner/Info.plist
               PRODUCT_TYPE = com.apple.product-type.application
               PROFILING_CODE = NO
               PROJECT = Runner
               PROJECT_DERIVED_FILE_DIR = /Users/morgan/Programming/temp/myapp/build/ios/Runner.build/DerivedSources
               PROJECT_DIR = /Users/morgan/Programming/temp/myapp/ios
               PROJECT_FILE_PATH = /Users/morgan/Programming/temp/myapp/ios/Runner.xcodeproj
               PROJECT_NAME = Runner
               PROJECT_TEMP_DIR = /Users/morgan/Programming/temp/myapp/build/ios/Runner.build
               PROJECT_TEMP_ROOT = /Users/morgan/Programming/temp/myapp/build/ios
               PROVISIONING_PROFILE_REQUIRED = YES
               PUBLIC_HEADERS_FOLDER_PATH = Runner.app/Headers
               RECURSIVE_SEARCH_PATHS_FOLLOW_SYMLINKS = YES
               REMOVE_CVS_FROM_RESOURCES = YES
               REMOVE_GIT_FROM_RESOURCES = YES
               REMOVE_HEADERS_FROM_EMBEDDED_BUNDLES = YES
               REMOVE_HG_FROM_RESOURCES = YES
               REMOVE_SVN_FROM_RESOURCES = YES
               RESOURCE_RULES_REQUIRED = YES
               REZ_COLLECTOR_DIR = /Users/morgan/Programming/temp/myapp/build/ios/Runner.build/Release-iphoneos/Runner.build/ResourceManagerResources
               REZ_OBJECTS_DIR = /Users/morgan/Programming/temp/myapp/build/ios/Runner.build/Release-iphoneos/Runner.build/ResourceManagerResources/Objects
               SCAN_ALL_SOURCE_FILES_FOR_INCLUDES = NO
               SCRIPTS_FOLDER_PATH = Runner.app/Scripts
               SDKROOT = /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS11.0.sdk
               SDK_DIR = /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS11.0.sdk
               SDK_DIR_iphoneos11_0 = /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS11.0.sdk
               SDK_NAME = iphoneos11.0
               SDK_NAMES = iphoneos11.0
               SDK_PRODUCT_BUILD_VERSION = 15A5361a
               SDK_VERSION = 11.0
               SDK_VERSION_ACTUAL = 110000
               SDK_VERSION_MAJOR = 110000
               SDK_VERSION_MINOR = 000
               SED = /usr/bin/sed
               SEPARATE_STRIP = NO
               SEPARATE_SYMBOL_EDIT = NO
               SET_DIR_MODE_OWNER_GROUP = YES
               SET_FILE_MODE_OWNER_GROUP = NO
               SHALLOW_BUNDLE = YES
               SHARED_DERIVED_FILE_DIR = /Users/morgan/Programming/temp/myapp/build/ios/Release-iphoneos/DerivedSources
               SHARED_FRAMEWORKS_FOLDER_PATH = Runner.app/SharedFrameworks
               SHARED_PRECOMPS_DIR = /Users/morgan/Programming/temp/myapp/build/ios/SharedPrecompiledHeaders
               SHARED_SUPPORT_FOLDER_PATH = Runner.app/SharedSupport
               SKIP_INSTALL = NO
               SOURCE_ROOT = /Users/morgan/Programming/temp/myapp/ios
               SRCROOT = /Users/morgan/Programming/temp/myapp/ios
               STRINGS_FILE_OUTPUT_ENCODING = binary
               STRIP_BITCODE_FROM_COPIED_FILES = YES
               STRIP_INSTALLED_PRODUCT = YES
               STRIP_STYLE = all
               STRIP_SWIFT_SYMBOLS = YES
               SUPPORTED_DEVICE_FAMILIES = 1,2
               SUPPORTED_PLATFORMS = iphonesimulator iphoneos
               SUPPORTS_TEXT_BASED_API = NO
               SWIFT_PLATFORM_TARGET_PREFIX = ios
               SYMROOT = /Users/morgan/Programming/temp/myapp/build/ios
               SYSTEM_ADMIN_APPS_DIR = /Applications/Utilities
               SYSTEM_APPS_DIR = /Applications
               SYSTEM_CORE_SERVICES_DIR = /System/Library/CoreServices
               SYSTEM_DEMOS_DIR = /Applications/Extras
               SYSTEM_DEVELOPER_APPS_DIR = /Applications/Xcode-beta.app/Contents/Developer/Applications
               SYSTEM_DEVELOPER_BIN_DIR = /Applications/Xcode-beta.app/Contents/Developer/usr/bin
               SYSTEM_DEVELOPER_DEMOS_DIR = /Applications/Xcode-beta.app/Contents/Developer/Applications/Utilities/Built Examples
               SYSTEM_DEVELOPER_DIR = /Applications/Xcode-beta.app/Contents/Developer
               SYSTEM_DEVELOPER_DOC_DIR = /Applications/Xcode-beta.app/Contents/Developer/ADC Reference Library
               SYSTEM_DEVELOPER_GRAPHICS_TOOLS_DIR = /Applications/Xcode-beta.app/Contents/Developer/Applications/Graphics Tools
               SYSTEM_DEVELOPER_JAVA_TOOLS_DIR = /Applications/Xcode-beta.app/Contents/Developer/Applications/Java Tools
               SYSTEM_DEVELOPER_PERFORMANCE_TOOLS_DIR = /Applications/Xcode-beta.app/Contents/Developer/Applications/Performance Tools
               SYSTEM_DEVELOPER_RELEASENOTES_DIR = /Applications/Xcode-beta.app/Contents/Developer/ADC Reference Library/releasenotes
               SYSTEM_DEVELOPER_TOOLS = /Applications/Xcode-beta.app/Contents/Developer/Tools
               SYSTEM_DEVELOPER_TOOLS_DOC_DIR = /Applications/Xcode-beta.app/Contents/Developer/ADC Reference Library/documentation/DeveloperTools
               SYSTEM_DEVELOPER_TOOLS_RELEASENOTES_DIR = /Applications/Xcode-beta.app/Contents/Developer/ADC Reference Library/releasenotes/DeveloperTools
               SYSTEM_DEVELOPER_USR_DIR = /Applications/Xcode-beta.app/Contents/Developer/usr
               SYSTEM_DEVELOPER_UTILITIES_DIR = /Applications/Xcode-beta.app/Contents/Developer/Applications/Utilities
               SYSTEM_DOCUMENTATION_DIR = /Library/Documentation
               SYSTEM_KEXT_INSTALL_PATH = /System/Library/Extensions
               SYSTEM_LIBRARY_DIR = /System/Library
               TAPI_VERIFY_MODE = ErrorsOnly
               TARGETED_DEVICE_FAMILY = 1,2
               TARGETNAME = Runner
               TARGET_BUILD_DIR = /Users/morgan/Programming/temp/myapp/build/ios/Release-iphoneos
               TARGET_NAME = Runner
               TARGET_TEMP_DIR = /Users/morgan/Programming/temp/myapp/build/ios/Runner.build/Release-iphoneos/Runner.build
               TEMP_DIR = /Users/morgan/Programming/temp/myapp/build/ios/Runner.build/Release-iphoneos/Runner.build
               TEMP_FILES_DIR = /Users/morgan/Programming/temp/myapp/build/ios/Runner.build/Release-iphoneos/Runner.build
               TEMP_FILE_DIR = /Users/morgan/Programming/temp/myapp/build/ios/Runner.build/Release-iphoneos/Runner.build
               TEMP_ROOT = /Users/morgan/Programming/temp/myapp/build/ios
               TOOLCHAIN_DIR = /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain
               TREAT_MISSING_BASELINES_AS_TEST_FAILURES = NO
               UID = 501
               UNLOCALIZED_RESOURCES_FOLDER_PATH = Runner.app
               UNSTRIPPED_PRODUCT = NO
               USER = morgan
               USER_APPS_DIR = /Users/morgan/Applications
               USER_LIBRARY_DIR = /Users/morgan/Library
               USE_DYNAMIC_NO_PIC = YES
               USE_HEADERMAP = YES
               USE_HEADER_SYMLINKS = NO
               VALIDATE_PRODUCT = YES
               VALID_ARCHS = arm64 armv7 armv7s
               VERBOSE_PBXCP = NO
               VERSIONPLIST_PATH = Runner.app/version.plist
               VERSION_INFO_BUILDER = morgan
               VERSION_INFO_FILE = Runner_vers.c
               VERSION_INFO_STRING = "@(#)PROGRAM:Runner  PROJECT:Runner-"
               WRAPPER_EXTENSION = app
               WRAPPER_NAME = Runner.app
               WRAPPER_SUFFIX = .app
               WRAP_ASSET_PACKS_IN_SEPARATE_DIRECTORIES = NO
               XCODE_APP_SUPPORT_DIR = /Applications/Xcode-beta.app/Contents/Developer/Library/Xcode
               XCODE_PRODUCT_BUILD_VERSION = 9M214v
               XCODE_VERSION_ACTUAL = 0900
               XCODE_VERSION_MAJOR = 0900
               XCODE_VERSION_MINOR = 0900
               XPCSERVICES_FOLDER_PATH = Runner.app/XPCServices
               YACC = yacc
               arch = arm64
               variant = normal
[  +66 ms] tail -n 0 -F /Users/morgan/Library/Logs/CoreSimulator/2CF233EB-27B2-4464-9C07-FFC924A1B630/system.log
[   +6 ms] Building Runner.app for 2CF233EB-27B2-4464-9C07-FFC924A1B630.
[  +11 ms] Building build/app.flx
[ +156 ms] tail -n 0 -F /private/var/log/system.log
[ +211 ms] which zip
[   +7 ms] Encoding zip file to build/app.flx
[  +33 ms] [build/flx/] zip -q /Users/morgan/Programming/temp/myapp/build/app.flx fonts/MaterialIcons-Regular.ttf AssetManifest.json FontManifest.json LICENSE
[  +54 ms] Built build/app.flx.
[   +1 ms] /usr/bin/xcrun simctl get_app_container 2CF233EB-27B2-4464-9C07-FFC924A1B630 com.yourcompany.myapp
[        ] /usr/bin/killall Runner
[  +63 ms] [DEVICE LOG] Sep  5 15:43:23 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (UIKitApplication:com.yourcompany.myapp[0x582f][32397][33539]): Service exited due to signal: Terminated: 15 sent by killall[33639]
[ +102 ms] /usr/bin/xcrun simctl launch 2CF233EB-27B2-4464-9C07-FFC924A1B630 com.yourcompany.myapp --enable-dart-profiling --flx=/Users/morgan/Programming/temp/myapp/build/app.flx --dart-main=/Users/morgan/Programming/temp/myapp/lib/main.dart --packages=/Users/morgan/Programming/temp/myapp/.packages --enable-checked-mode --observatory-port=8102 --diagnostic-port=8103
[ +224 ms] com.yourcompany.myapp: 33641
[        ] Waiting for observatory port to be available...
[+1142 ms] [DEVICE LOG] Sep  5 15:43:24 Richards-MacBook Runner[33641]: assertion failed: 16G29 15A5361a: libxpc.dylib + 69578 [EF78594B-BD50-3F3B-B607-190E9A20F4E9]: 0x7d
[+146461 ms] [SYS LOG] Sep  5 15:45:51 Richards-MacBook com.apple.xpc.launchd[1] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for integer: _DirtyJetsamMemoryLimit
[+2852 ms] [SYS LOG] Sep  5 15:45:54 Richards-MacBook xpcproxy[33744]: libcoreservices: _dirhelper_userdir: 523: bootstrap_look_up returned 268435459
[+1945 ms] [SYS LOG] Sep  5 15:45:56 Richards-MacBook akd[33746]: objc[33746]: Class AKToken is implemented in both /System/Library/PrivateFrameworks/AuthKit.framework/Versions/A/AuthKit (0x7fffd04d7338) and /System/Library/PrivateFrameworks/AuthKit.framework/Versions/A/Support/akd (0x10d3d76b8). One of the two will be used. Which one is undefined.
[        ] [SYS LOG] Sep  5 15:45:56 Richards-MacBook akd[33746]: objc[33746]: Class AKMasterToken is implemented in both /System/Library/PrivateFrameworks/AuthKit.framework/Versions/A/AuthKit (0x7fffd04d7388) and /System/Library/PrivateFrameworks/AuthKit.framework/Versions/A/Support/akd (0x10d3d7708). One of the two will be used. Which one is undefined.
[+232871 ms] [SYS LOG] Sep  5 15:49:48 Richards-MacBook syslogd[23]: ASL Sender Statistics
[+21070 ms] [SYS LOG] Sep  5 15:50:09 Richards-MacBook GoogleSoftwareUpdateAgent[33907]: 2017-09-05 15:50:09.947 GoogleSoftwareUpdateAgent[33907/0x7fffd29113c0] [lvl=2] -[KSAgentApp(PrivateMethods) setupLoggerOutput] Agent default/global settings: <KSAgentSettings:0x100307030 bundleID=com.google.Keystone.Agent lastCheck=2017-09-05 21:49:46 +0000 lastServerCheck=2017-09-05 21:49:44 +0000 lastCheckStart=2017-09-05 21:49:24 +0000 checkInterval=18000.000000 uiDisplayInterval=604800.000000 sleepInterval=1800.000000 jitterInterval=900 maxRunInterval=0.000000 isConsoleUser=1 ticketStorePath=/Users/morgan/Library/Google/GoogleSoftwareUpdate/TicketStore/Keystone.ticketstore runMode=3 daemonUpdateEngineBrokerServiceName=com.google.Keystone.Daemon.UpdateEngine daemonAdministrationServiceName=com.google.Keystone.Daemon.Administration logEverything=0 logBufferSize=2048 alwaysPromptForUpdates=0 productIDToUpdate=(null) lastUIDisplayed=(null) alwaysShowStatusItem=0 updateCheckTag=(null) printResults=NO userInitiated=NO>
[+153604 ms] [SYS LOG] Sep  5 15:52:43 Richards-MacBook pbs[32741]: BUG in libdispatch client: kevent[EVFILT_MACHPORT] monitored resource vanished before the source cancel handler was invoked
[+47651 ms] [DEVICE LOG] Sep  5 15:53:31 Richards-MacBook Preferences[34031]: objc[34031]: Class SFUserNotification is implemented in both /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/Library/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/System/Library/PrivateFrameworks/Sharing.framework/Sharing (0x11d3164c8) and /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/Library/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/System/Library/Frameworks/SafariServices.framework/SafariServices (0x1219c6388). One of the two will be used. Which one is undefined.
[   +3 ms] [DEVICE LOG] Sep  5 15:53:31 Richards-MacBook syslogd[32373]: ASL Sender Statistics
[ +209 ms] [DEVICE LOG] Sep  5 15:53:31 Richards-MacBook Preferences[34031]: assertion failed: 16G29 15A5361a: libxpc.dylib + 69578 [EF78594B-BD50-3F3B-B607-190E9A20F4E9]: 0x7d
[ +231 ms] [DEVICE LOG] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.WebKit.Networking): Unknown key for Boolean: EnableTransactions
[  +11 ms] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.WebKit.Networking): Unknown key for Boolean: EnableTransactions
[   +3 ms] [DEVICE LOG] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.WebKit.Networking): Unknown key for Boolean: EnablePressuredExit
[        ] [DEVICE LOG] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.IdentityLookup.MessageFilter): Unknown key for Boolean: EnableTransactions
[        ] [DEVICE LOG] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.IdentityLookup.MessageFilter): Unknown key for Boolean: EnablePressuredExit
[        ] [DEVICE LOG] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.WebKit.Databases): Unknown key for Boolean: EnableTransactions
[  +28 ms] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.WebKit.Networking): Unknown key for Boolean: EnablePressuredExit
[        ] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.IdentityLookup.MessageFilter): Unknown key for Boolean: EnableTransactions
[        ] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.IdentityLookup.MessageFilter): Unknown key for Boolean: EnablePressuredExit
[        ] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.WebKit.Databases): Unknown key for Boolean: EnableTransactions
[   +1 ms] [DEVICE LOG] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.WebKit.Databases): Unknown key for Boolean: EnablePressuredExit
[  +33 ms] [DEVICE LOG] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.intents.intents-image-service): Unknown key for Boolean: EnableTransactions
[        ] [DEVICE LOG] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.intents.intents-image-service): Unknown key for Boolean: EnablePressuredExit
[        ] [DEVICE LOG] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for Boolean: EnableTransactions
[        ] [DEVICE LOG] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for integer: _DirtyJetsamMemoryLimit
[        ] [DEVICE LOG] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for Boolean: EnablePressuredExit
[        ] [DEVICE LOG] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.SafariServices.ContentBlockerLoader): Unknown key for Boolean: EnableTransactions
[        ] [DEVICE LOG] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.SafariServices.ContentBlockerLoader): Unknown key for Boolean: EnablePressuredExit
[        ] [DEVICE LOG] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.DictionaryServiceHelper): Unknown key for Boolean: EnableTransactions
[        ] [DEVICE LOG] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.DictionaryServiceHelper): Unknown key for Boolean: EnablePressuredExit
[        ] [DEVICE LOG] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.WebKit.WebContent): Unknown key for Boolean: EnableTransactions
[        ] [DEVICE LOG] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.WebKit.WebContent): Unknown key for Boolean: EnablePressuredExit
[        ] [DEVICE LOG] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.AssetCacheLocatorService): Unknown key for Boolean: EnableTransactions
[        ] [DEVICE LOG] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.AssetCacheLocatorService): Unknown key for Boolean: EnablePressuredExit
[        ] [DEVICE LOG] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.Photos.CPLDiagnose): Unknown key for Boolean: EnableTransactions
[        ] [DEVICE LOG] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.Photos.CPLDiagnose): Unknown key for Boolean: EnablePressuredExit
[        ] [DEVICE LOG] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.StreamingUnzipService): Unknown key for Boolean: EnableTransactions
[        ] [DEVICE LOG] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.StreamingUnzipService): Unknown key for Boolean: EnablePressuredExit
[        ] [DEVICE LOG] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.ClassroomKit.ScreenshotService): Unknown key for Boolean: EnableTransactions
[        ] [DEVICE LOG] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.ClassroomKit.ScreenshotService): Unknown key for Boolean: EnablePressuredExit
[        ] [DEVICE LOG] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.Safari.ImageDecoder): Unknown key for Boolean: EnableTransactions
[        ] [DEVICE LOG] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.Safari.ImageDecoder): Unknown key for Boolean: EnablePressuredExit
[        ] [DEVICE LOG] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.Safari.History): Unknown key for Boolean: EnableTransactions
[        ] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.WebKit.Databases): Unknown key for Boolean: EnablePressuredExit
[        ] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.intents.intents-image-service): Unknown key for Boolean: EnableTransactions
[        ] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.intents.intents-image-service): Unknown key for Boolean: EnablePressuredExit
[        ] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for Boolean: EnableTransactions
[        ] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for integer: _DirtyJetsamMemoryLimit
[        ] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for Boolean: EnablePressuredExit
[        ] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.SafariServices.ContentBlockerLoader): Unknown key for Boolean: EnableTransactions
[        ] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.SafariServices.ContentBlockerLoader): Unknown key for Boolean: EnablePressuredExit
[        ] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.DictionaryServiceHelper): Unknown key for Boolean: EnableTransactions
[        ] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.DictionaryServiceHelper): Unknown key for Boolean: EnablePressuredExit
[        ] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.WebKit.WebContent): Unknown key for Boolean: EnableTransactions
[        ] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.WebKit.WebContent): Unknown key for Boolean: EnablePressuredExit
[        ] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.AssetCacheLocatorService): Unknown key for Boolean: EnableTransactions
[        ] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.AssetCacheLocatorService): Unknown key for Boolean: EnablePressuredExit
[        ] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.Photos.CPLDiagnose): Unknown key for Boolean: EnableTransactions
[        ] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.Photos.CPLDiagnose): Unknown key for Boolean: EnablePressuredExit
[        ] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.StreamingUnzipService): Unknown key for Boolean: EnableTransactions
[        ] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.StreamingUnzipService): Unknown key for Boolean: EnablePressuredExit
[        ] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.ClassroomKit.ScreenshotService): Unknown key for Boolean: EnableTransactions
[        ] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.ClassroomKit.ScreenshotService): Unknown key for Boolean: EnablePressuredExit
[        ] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.Safari.ImageDecoder): Unknown key for Boolean: EnableTransactions
[        ] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.Safari.ImageDecoder): Unknown key for Boolean: EnablePressuredExit
[        ] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.Safari.History): Unknown key for Boolean: EnableTransactions
[        ] [DEVICE LOG] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.Safari.History): Unknown key for Boolean: EnablePressuredExit
[        ] [DEVICE LOG] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.icloud.FMF.FMFMapXPCService): Unknown key for Boolean: EnableTransactions
[        ] [DEVICE LOG] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.icloud.FMF.FMFMapXPCService): Unknown key for Boolean: EnablePressuredExit
[        ] [DEVICE LOG] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.uifoundation-bundle-helper): Unknown key for Boolean: EnableTransactions
[        ] [DEVICE LOG] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.uifoundation-bundle-helper): Unknown key for Boolean: EnablePressuredExit
[        ] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.Safari.History): Unknown key for Boolean: EnablePressuredExit
[        ] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.icloud.FMF.FMFMapXPCService): Unknown key for Boolean: EnableTransactions
[        ] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.icloud.FMF.FMFMapXPCService): Unknown key for Boolean: EnablePressuredExit
[  +11 ms] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.uifoundation-bundle-helper): Unknown key for Boolean: EnableTransactions
[        ] Sep  5 15:53:31 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.uifoundation-bundle-helper): Unknown key for Boolean: EnablePressuredExit
[ +257 ms] [DEVICE LOG] Sep  5 15:53:32 Richards-MacBook Preferences[34031]: objc[34031]: Class VCWeakObjectHolder is implemented in both /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/Library/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/System/Library/PrivateFrameworks/AVConference.framework/Frameworks/ViceroyTrace.framework/ViceroyTrace (0x1286fb490) and /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/Library/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/System/Library/PrivateFrameworks/AVConference.framework/AVConference (0x128589fc8). One of the two will be used. Which one is undefined.
[ +101 ms] [DEVICE LOG] Sep  5 15:53:32 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for Boolean: EnableTransactions
[        ] Sep  5 15:53:32 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for Boolean: EnableTransactions
[   +1 ms] [DEVICE LOG] Sep  5 15:53:32 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for integer: _DirtyJetsamMemoryLimit
[        ] Sep  5 15:53:32 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for integer: _DirtyJetsamMemoryLimit
[   +5 ms] [DEVICE LOG] Sep  5 15:53:32 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for Boolean: EnablePressuredExit
[  +16 ms] Sep  5 15:53:32 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for Boolean: EnablePressuredExit
[ +426 ms] [DEVICE LOG] Sep  5 15:53:32 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.AnnotationKit.MigratorService): Unknown key for Boolean: EnableTransactions
[        ] Sep  5 15:53:32 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.AnnotationKit.MigratorService): Unknown key for Boolean: EnableTransactions
[        ] [DEVICE LOG] Sep  5 15:53:32 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.AnnotationKit.MigratorService): Unknown key for Boolean: EnablePressuredExit
[        ] Sep  5 15:53:32 Richards-MacBook com.apple.CoreSimulator.SimDevice.2CF233EB-27B2-4464-9C07-FFC924A1B630[32371] (com.apple.AnnotationKit.MigratorService): Unknown key for Boolean: EnablePressuredExit
[+72341 ms] [SYS LOG] Sep  5 15:54:44 Richards-MacBook com.apple.xpc.launchd[1] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for integer: _DirtyJetsamMemoryLimit
[+101291 ms] [SYS LOG] Sep  5 15:56:26 Richards-MacBook com.apple.xpc.launchd[1] (com.apple.ReportCrash[34143]): Endpoint has been activated through legacy launch(3) APIs. Please switch to XPC or bootstrap_check_in(): com.apple.ReportCrash
[+7262 ms] [DEVICE LOG] Sep  5 15:56:33 Richards-MacBook launchd_sim[32371]: BUG in libdispatch client: kevent[mach_recv] monitored resource vanished before the source cancel handler was invoked
[+52889 ms] [SYS LOG] Sep  5 15:57:26 Richards-MacBook com.apple.xpc.launchd[1] (com.apple.metadata.mds[48]): Service exited due to signal: Segmentation fault: 11 sent by exc handler[0]
[        ] [SYS LOG] Sep  5 15:57:26 Richards-MacBook com.apple.xpc.launchd[1] (com.apple.ReportCrash.Root[34181]): Endpoint has been activated through legacy launch(3) APIs. Please switch to XPC or bootstrap_check_in(): com.apple.ReportCrash.DirectoryService
[+42869 ms] [SYS LOG] Sep  5 15:58:09 Richards-MacBook com.apple.xpc.launchd[1] (com.apple.quicklook[34219]): Endpoint has been activated through legacy launch(3) APIs. Please switch to XPC or bootstrap_check_in(): com.apple.quicklook

Also ran flutter analyze but no issues were found.
Flutter Doctor
[✓] Flutter (on Mac OS X 10.12.6 16G29, locale en-CA, channel alpha)
    • Flutter at /Users/morgan/flutter
    • Framework revision 1c372c6803 (5 days ago), 2017-08-31 15:54:45 -0700
    • Engine revision f9e00a7c72
    • Tools Dart version 1.25.0-dev.11.0

[✓] Android toolchain - develop for Android devices (Android SDK 26.0.1)
    • Android SDK at /Users/morgan/Library/Android/sdk
    • Platform android-26, build-tools 26.0.1
    • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_112-release-b06)

[✓] iOS toolchain - develop for iOS devices (Xcode 9.0)
    • Xcode at /Applications/Xcode-beta.app/Contents/Developer
    • Xcode 9.0, Build version 9M214v
    • ios-deploy 1.9.2
    • CocoaPods version 1.3.1

[✓] Android Studio (version 2.3)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Java version OpenJDK Runtime Environment (build 1.8.0_112-release-b06)

[✓] IntelliJ IDEA Community Edition (version 2017.2.3)
    • Flutter plugin version 17.0
    • Dart plugin version 172.3968.27

[✓] Connected devices
    • Android SDK built for x86 • emulator-5554                        • android-x86 • Android 8.0.0 (API 26) (emulator)
    • iPhone 7                  • 2CF233EB-27B2-4464-9C07-FFC924A1B630 • ios         • iOS 11.0 (simulator)

Notes ported over from dupe issue #12085
Steps to Reproduce
In a flutter application directory:

Use xcode-select to select Xcode 9.
Launch an Xcode 9 simulator with iOS 11.
flutter run

Expected result: edit-refresh development works as usual.
Actual result: hang waiting for observatory.
flutter_tools currently tails the simulator device's syslog file, which as of iOS 11 no longer contains the flutter engine logs. These are, however, now available through /usr/bin/log.
Note that the issue is iOS 11 simulator-specific. Running an iOS 9.3 simulator under Xcode 9 works as-is, as do physical iOS 10 and 11 devices in my testing.

Fixed by #12079. Give it a go with the Xcode 9 GM and you should be all set for some exciting iPhone X Flutter development!

it does not seems to be fixed:
From https://github.com/flutter/flutter
   3433f42b0..63d7b9338  master     -> origin/master
Already up-to-date.

Upgrading engine...
Already up-to-date.

Flutter • channel alpha • https://github.com/flutter/flutter.git
Framework • revision 701d534ba9 (2 weeks ago) • 2017-09-12 14:01:51 -0700
Engine • revision 31d03de019
Tools • Dart 1.25.0-dev.11.0

Running "flutter packages upgrade" in myapp...        7.8s

Running flutter doctor...
[✓] Flutter (on Mac OS X 10.12.6 16G29, locale en-IT, channel alpha)
    • Flutter at /Users/mnova/dev/tests/flutter/flutter
    • Framework revision 701d534ba9 (2 weeks ago), 2017-09-12 14:01:51 -0700
    • Engine revision 31d03de019
    • Tools Dart version 1.25.0-dev.11.0

[✗] Android toolchain - develop for Android devices
    ✗ Unable to locate Android SDK.
      Install Android Studio from: https://developer.android.com/studio/index.html
      On first launch it will assist you in installing the Android SDK components.
      (or visit https://flutter.io/setup/#android-setup for detailed instructions).
      If Android SDK has been installed to a custom location, set $ANDROID_HOME to that location.

[✓] iOS toolchain - develop for iOS devices (Xcode 9.0)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 9.0, Build version 9A235
    • ios-deploy 1.9.2
    • CocoaPods version 1.3.1

[-] Android Studio
    • Android Studio at /Applications/dev/Android Studio.app/Contents
    ✗ Unable to find bundled Java version.
    • Try updating or re-installing Android Studio.

[-] IntelliJ IDEA Community Edition (version 2016.3.4)
    ✗ Flutter plugin not installed; this adds Flutter specific functionality.
    ✗ Dart plugin not installed; this adds Dart specific functionality.
    • For information about installing plugins, see
      https://flutter.io/intellij-setup/#installing-the-plugins
    ✗ This install is older than the minimum recommended version of 2017.1.0.

[✓] IntelliJ IDEA Ultimate Edition (version 2017.2.3)
    • Flutter plugin version 17.0
    • Dart plugin version 172.3968.27

[✓] Connected devices
    • None

and then:
flutter  run
Launching lib/main.dart on iPhone 7 in debug mode...
Running Xcode build...                               10.2s
Sep 27 15:52:14 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.ServerDocuments.ServerFileProvider): Unknown key for Boolean: EnableTransactions
Sep 27 15:52:14 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.ServerDocuments.ServerFileProvider): Unknown key for Boolean: EnablePressuredExit
Sep 27 15:52:14 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.videosubscriptionsd): Service only ran for 0 seconds. Pushing respawn out by 10 seconds.
Sep 27 15:52:14 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for Boolean: EnableTransactions
Sep 27 15:52:14 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for integer: _DirtyJetsamMemoryLimit
Sep 27 15:52:14 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for Boolean: EnablePressuredExit
Sep 27 15:52:14 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.AssetCacheLocatorService): Unknown key for Boolean: EnableTransactions
Sep 27 15:52:14 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.AssetCacheLocatorService): Unknown key for Boolean: EnablePressuredExit
Sep 27 15:52:14 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.StreamingUnzipService): Unknown key for Boolean: EnableTransactions
Sep 27 15:52:14 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.StreamingUnzipService): Unknown key for Boolean: EnablePressuredExit
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.WebKit.Networking): Unknown key for Boolean: EnableTransactions
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.WebKit.Networking): Unknown key for Boolean: EnablePressuredExit
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.intents.intents-image-service): Unknown key for Boolean: EnableTransactions
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.intents.intents-image-service): Unknown key for Boolean: EnablePressuredExit
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for Boolean: EnableTransactions
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for integer: _DirtyJetsamMemoryLimit
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for Boolean: EnablePressuredExit
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.WebKit.Databases): Unknown key for Boolean: EnableTransactions
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.WebKit.Databases): Unknown key for Boolean: EnablePressuredExit
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.DictionaryServiceHelper): Unknown key for Boolean: EnableTransactions
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.DictionaryServiceHelper): Unknown key for Boolean: EnablePressuredExit
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.AnnotationKit.MigratorService): Unknown key for Boolean: EnableTransactions
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.AnnotationKit.MigratorService): Unknown key for Boolean: EnablePressuredExit
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.WebKit.WebContent): Unknown key for Boolean: EnableTransactions
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.WebKit.WebContent): Unknown key for Boolean: EnablePressuredExit
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.AssetCacheLocatorService): Unknown key for Boolean: EnableTransactions
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.AssetCacheLocatorService): Unknown key for Boolean: EnablePressuredExit
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.Photos.CPLDiagnose): Unknown key for Boolean: EnableTransactions
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.Photos.CPLDiagnose): Unknown key for Boolean: EnablePressuredExit
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.StreamingUnzipService): Unknown key for Boolean: EnableTransactions
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.StreamingUnzipService): Unknown key for Boolean: EnablePressuredExit
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.uifoundation-bundle-helper): Unknown key for Boolean: EnableTransactions
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.uifoundation-bundle-helper): Unknown key for Boolean: EnablePressuredExit
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.Safari.ImageDecoder): Unknown key for Boolean: EnableTransactions
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.Safari.ImageDecoder): Unknown key for Boolean: EnablePressuredExit
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.Safari.History): Unknown key for Boolean: EnableTransactions
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.Safari.History): Unknown key for Boolean: EnablePressuredExit
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.CloudDocs.MobileDocumentsFileProvider): Unknown key for Boolean: EnableTransactions
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.CloudDocs.MobileDocumentsFileProvider): Unknown key for Boolean: EnablePressuredExit
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.CloudDocsDaemon.container-metadata-extractor): Unknown key for Boolean: EnableTransactions
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.CloudDocsDaemon.container-metadata-extractor): Unknown key for Boolean: EnablePressuredExit
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.mobileslideshow.PhotosFileProvider): Unknown key for Boolean: EnableTransactions
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.mobileslideshow.PhotosFileProvider): Unknown key for Boolean: EnablePressuredExit
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.intents.intents-image-service): Unknown key for Boolean: EnableTransactions
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.intents.intents-image-service): Unknown key for Boolean: EnablePressuredExit
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for Boolean: EnableTransactions
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for integer: _DirtyJetsamMemoryLimit
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for Boolean: EnablePressuredExit
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.DictionaryServiceHelper): Unknown key for Boolean: EnableTransactions
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.DictionaryServiceHelper): Unknown key for Boolean: EnablePressuredExit
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.AssetCacheLocatorService): Unknown key for Boolean: EnableTransactions
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.AssetCacheLocatorService): Unknown key for Boolean: EnablePressuredExit
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.Photos.CPLDiagnose): Unknown key for Boolean: EnableTransactions
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.Photos.CPLDiagnose): Unknown key for Boolean: EnablePressuredExit
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.StreamingUnzipService): Unknown key for Boolean: EnableTransactions
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.StreamingUnzipService): Unknown key for Boolean: EnablePressuredExit
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.uifoundation-bundle-helper): Unknown key for Boolean: EnableTransactions
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.uifoundation-bundle-helper): Unknown key for Boolean: EnablePressuredExit
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.FileProvider.LocalStorage): Unknown key for Boolean: EnableTransactions
Sep 27 15:52:15 mnova-mac-it com.apple.CoreSimulator.SimDevice.EE6B4E55-E5EC-4B24-9BD5-5444F120F82B[66813] (com.apple.FileProvider.LocalStorage): Unknown key for Boolean: EnablePressuredExit

You're going to have to switch to the master branch for now to pick up the changes that fixed this. Looks like the alpha branch only has up to Sept 12th and the changes were merged in on the 14th.

@rmtmckenzie Thank you! shame on me! I thought that alpha was the bleeding edge while in fact master is the bleeding edge!