[Known Build Error] iOS UITest screenshot baseline mismatches after ACES pool migration

[PureWeen]

Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1276073
Leg Name: iOS UITests Mono (v18.4)

Description

iOS screenshot-based UITests are failing after the migration to ACES agent pools (PR #33790). The new macOS 26 (Tahoe) environment renders slightly differently than the previous macOS 15 (Sequoia), causing screenshot comparison failures.

Root Cause: PR #33790 switched CI from MAUI pool to AcesShared pool with different macOS version.

Partially Fixed: PR #33910 updated baselines and added cropBottom/Assert.Ignore for the original 14 tests. The 4 tests below were not covered by that PR and are still failing.

Affected Tests

• ContentPage_Title_WithBackgroundColor
• VerifyClearButtonVisiblityWhenTextAlignedVertically
• VerifyClearButtonVisiblityWhenTextPresentOrEmpty
• VerifyClearVisiblityButtonWhenTextColorChanged

Error Message

{
  "ErrorPattern": "Snapshot different than baseline: (ContentPage_Title_WithBackgroundColor|VerifyClearButtonVisiblityWhenTextAlignedVertically|VerifyClearButtonVisiblityWhenTextPresentOrEmpty|VerifyClearVisiblityButtonWhenTextColorChanged)\\.png",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1276073
Error message validated: [Snapshot different than baseline: (ContentPage_Title_WithBackgroundColor|VerifyClearButtonVisiblityWhenTextAlignedVertically|VerifyClearButtonVisiblityWhenTextPresentOrEmpty|VerifyClearVisiblityButtonWhenTextColorChanged)\.png]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 2/9/2026 9:25:22 PM UTC

Report

Build	Repository	Test	Pull Request
3000537	dotnet-maui	Microsoft.Maui.TestCases.Tests.ContentPageFeatureTests(iOS).ContentPage_Title_WithBackgroundColor
1464606	dotnet/maui	Microsoft.Maui.TestCases.Tests.EntryFeatureTests(iOS).VerifyClearButtonVisiblityWhenTextAlignedVertically	#35898
1464366	dotnet/maui	Microsoft.Maui.TestCases.Tests.EntryFeatureTests(iOS).VerifyClearButtonVisiblityWhenTextAlignedVertically
2999170	dotnet-maui	Microsoft.Maui.TestCases.Tests.EntryFeatureTests(iOS).VerifyClearVisiblityButtonWhenTextColorChanged
1462100	dotnet/maui	Microsoft.Maui.TestCases.Tests.EntryFeatureTests(iOS).VerifyClearButtonVisiblityWhenTextAlignedVertically
1461936	dotnet/maui	Microsoft.Maui.TestCases.Tests.EntryFeatureTests(iOS).VerifyClearButtonVisiblityWhenTextAlignedVertically	#35716
2998980	dotnet-maui	Microsoft.Maui.TestCases.Tests.EntryFeatureTests(iOS).VerifyClearVisiblityButtonWhenTextColorChanged
1461650	dotnet/maui	Microsoft.Maui.TestCases.Tests.EntryFeatureTests(Mac).VerifyClearButtonVisiblityWhenTextAlignedVertically
2998833	dotnet-maui	Microsoft.Maui.TestCases.Tests.ContentPageFeatureTests(iOS).ContentPage_Title_WithBackgroundColor
1461187	dotnet/maui	Microsoft.Maui.TestCases.Tests.EntryFeatureTests(iOS).VerifyClearButtonVisiblityWhenTextAlignedVertically
1461034	dotnet/maui	Microsoft.Maui.TestCases.Tests.EntryFeatureTests(iOS).VerifyClearButtonVisiblityWhenTextAlignedVertically	#35762
1461287	dotnet/maui	Microsoft.Maui.TestCases.Tests.EntryFeatureTests(iOS).VerifyClearButtonVisiblityWhenTextAlignedVertically	#35716
2998115	dotnet-maui	Microsoft.Maui.TestCases.Tests.EntryFeatureTests(iOS).VerifyClearVisiblityButtonWhenTextColorChanged
2997946	dotnet-maui	Microsoft.Maui.TestCases.Tests.ContentPageFeatureTests(iOS).ContentPage_Title_WithBackgroundColor
2996913	dotnet-maui	Microsoft.Maui.TestCases.Tests.EntryFeatureTests(iOS).VerifyClearVisiblityButtonWhenTextColorChanged
1457243	dotnet/maui	Microsoft.Maui.TestCases.Tests.EntryFeatureTests(iOS).VerifyClearButtonVisiblityWhenTextAlignedVertically	#35762
1455464	dotnet/maui	Microsoft.Maui.TestCases.Tests.EntryFeatureTests(iOS).VerifyClearButtonVisiblityWhenTextAlignedVertically	#35762
2995332	dotnet-maui	Microsoft.Maui.TestCases.Tests.ContentPageFeatureTests(iOS).ContentPage_Title_WithBackgroundColor
1454320	dotnet/maui	Microsoft.Maui.TestCases.Tests.EntryFeatureTests(iOS).VerifyClearButtonVisiblityWhenTextAlignedVertically	#35762
2993279	dotnet-maui	Microsoft.Maui.TestCases.Tests.EntryFeatureTests(iOS).VerifyClearVisiblityButtonWhenTextColorChanged
2993258	dotnet-maui	Microsoft.Maui.TestCases.Tests.EntryFeatureTests(iOS).VerifyClearVisiblityButtonWhenTextColorChanged
2992977	dotnet-maui	Microsoft.Maui.TestCases.Tests.ContentPageFeatureTests(iOS).ContentPage_Title_WithBackgroundColor
1450931	dotnet/maui	Microsoft.Maui.TestCases.Tests.EntryFeatureTests(iOS).VerifyClearButtonVisiblityWhenTextAlignedVertically	#35762
2992237	dotnet-maui	Microsoft.Maui.TestCases.Tests.ContentPageFeatureTests(iOS).ContentPage_Title_WithBackgroundColor
1449357	dotnet/maui	Microsoft.Maui.TestCases.Tests.EntryFeatureTests(iOS).VerifyClearButtonVisiblityWhenTextAlignedVertically	#35762
2991453	dotnet-maui	Microsoft.Maui.TestCases.Tests.EntryFeatureTests(iOS).VerifyClearVisiblityButtonWhenTextColorChanged
2990578	dotnet-maui	Microsoft.Maui.TestCases.Tests.EntryFeatureTests(iOS).VerifyClearVisiblityButtonWhenTextColorChanged
2990403	dotnet-maui	Microsoft.Maui.TestCases.Tests.EntryFeatureTests(iOS).VerifyClearVisiblityButtonWhenTextColorChanged
2990517	dotnet-maui	Microsoft.Maui.TestCases.Tests.EntryFeatureTests(iOS).VerifyClearVisiblityButtonWhenTextColorChanged
2989385	dotnet-maui	Microsoft.Maui.TestCases.Tests.EntryFeatureTests(iOS).VerifyClearVisiblityButtonWhenTextColorChanged
1440405	dotnet/maui	Microsoft.Maui.TestCases.Tests.ContentPageFeatureTests(Android).ContentPage_Title_WithBackgroundColor	#35463
1438626	dotnet/maui	Microsoft.Maui.TestCases.Tests.ContentPageFeatureTests(Android).ContentPage_Title_WithBackgroundColor	#35463
2982050	dotnet-maui	Microsoft.Maui.TestCases.Tests.ContentPageFeatureTests(iOS).ContentPage_Title_WithBackgroundColor
2981849	dotnet-maui	Microsoft.Maui.TestCases.Tests.ContentPageFeatureTests(iOS).ContentPage_Title_WithBackgroundColor
2981132	dotnet-maui	Microsoft.Maui.TestCases.Tests.ContentPageFeatureTests(iOS).ContentPage_Title_WithBackgroundColor
2979787	dotnet-maui	Microsoft.Maui.TestCases.Tests.ContentPageFeatureTests(iOS).ContentPage_Title_WithBackgroundColor
2979449	dotnet-maui	Microsoft.Maui.TestCases.Tests.ContentPageFeatureTests(iOS).ContentPage_Title_WithBackgroundColor
2979158	dotnet-maui	Microsoft.Maui.TestCases.Tests.EntryFeatureTests(iOS).VerifyClearVisiblityButtonWhenTextColorChanged
2978899	dotnet-maui	Microsoft.Maui.TestCases.Tests.ContentPageFeatureTests(iOS).ContentPage_Title_WithBackgroundColor
2978769	dotnet-maui	Microsoft.Maui.TestCases.Tests.EntryFeatureTests(iOS).VerifyClearVisiblityButtonWhenTextColorChanged
2977978	dotnet-maui	Microsoft.Maui.TestCases.Tests.ContentPageFeatureTests(iOS).ContentPage_Title_WithBackgroundColor

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
3	18	41