Test failures:

flutter/flutter

• Compiling the engine on Xcode 26 for iOS fails with fatal error: 'UIUtilities/UIDefines.h' file not found #171755
• Current clang version doesn't build against the iOS 26 SDK, unknown platform 'visionos' #172335
• [Xcode 26 beta 3] Compiling the engine on macOS fails with plugin for module 'TestingMacros' not found #172155
• [ios] unit test fail on iOS 26: testFlutterPlatformViewTouchesEndedOrTouchesCancelledEventDoesNotFailTheGestureRecognizer #179907
• FlutterTextInputPluginTest crashes with "closure argument passed as @noescape to Objective-C has escaped" #183407
• Scenario App Integration Tests failing due to missing golden images for simulator 26.2 #183575

flutter/packages

• [google_maps_flutter_ios] Fails xcodebuild analyze on Xcode 26 beta 1 #170354
• [google_maps_flutter_ios] implicit conversion from enumeration type #170440
• Pod validation fails due to warnings with Xcode 26.0 #170437
• [webview_flutter_wkwebview] Swift formatting incorrect with Xcode 26 beta 4 #172983
• [in_app_purchase_storekit] Fix Xcode 26.2 analyzer warnings packages#10649
• webview_flutter_wkwebview tests crash during -[WKNavigationResponse dealloc] on Xcode 26 beta 4 #173326
• [webview_flutter_wkwebview] HTTPCookieProxyAPIDelegate warning Cannot explicitly specialize instance method 'map' #173744
• image_picker_ios tests crash failing on Xcode 26 beta 4: Failed due to not able to find an image with 30 seconds #173327
• [url_launcher_ios] URLLauncherUITests fail on iOS 26 #173100
• StateError in macos_objc_integration_tests (pigeon): "Cannot add new events after calling close" #180145
• [google_fonts] test failure: 'decorationStyle is honored when passed in via the TextStyle param' #180150
• Linux repo_checks failure: tool unit tests failing with missing trailing newlines #182842
• [webview_flutter_wkwebview] native tests crashing/restarting on ios 26 #182846
• [in_app_purchase_storekit] native tests failing with error mismatch with Xcode 26 #182845
• [Linux_web web_platform_tests_wasm_shard] Cannot render platform views #182844

Infra Issues:

• [CI] Metal toolchain is no longer bundled in Xcode and must be downloaded separately #170301
• [CI] Installing Xcode 26.0 sometimes fails when installing simulator #170355
• [CI] Xcode debug workflow doesn't work on Xcode 26 due to popup #173573
• [CI] Limit simulator tests to arm bots #170294
• [devicelab] Mac_arm64_ios flutter_gallery_ios__compile fails with Xcode 26 #175918
  • Some CI tests fails on Xcode 26 with undefined Swift symbols "__swift_FORCE_LOAD_$_swiftCompatibility" #175905
• iOS 26.0 Simulator runtime missing on Mac_arm64 builders (Xcode 26 upgrade) #180014
• [devicelab] xcodebuild fails with "exit code 65" using Xcode 26 #179936
• iOS Runtime duplicate error #180141
• mac_toolchain skips Metal Toolchain update when status is installedUpdateAvailable, causing metal compiler failures #183281