Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1342062
Build error leg or test failing: Shell, TabbedPage UITests on Android API30
Pull request: #34550

Error Message

Fill the error message using step by step known issues guidance.

{
  "ErrorMessage": "",
  "ErrorPattern": "Snapshot different than baseline: (VerifyShell_IsVisible|VerifyShell_TabBarBackgroundColor|VerifyShell_TabBarBackgroundColorAndTitleColor|VerifyShell_TabBarBackgroundColorSetToNull|VerifyShell_TabBarDisabledColor|VerifyShell_TabBarForegroundColorAndTitleColor|VerifyShell_TabBarTitleColor|VerifyShell_TabBarTitleColorAndUnSelectedColor|VerifyShell_TabBarUnselectedColor)\\.png",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Description

After merging main → net11.0 (PR #34550), UITests fail with screenshot baseline mismatches. The root cause is the Material3 package (#33450) changing BottomNavigationView.MaxItemCount from 5 → 6 on net11.0, which altered bottom tab layout rendering.

Status

16 of the original 26 snapshots have been fixed by PR #34601, which clamps MaxItemCount back to 5 and updates the affected baselines. Issue16918Test was split to its own Known Build Error (#34624) since it has a different root cause (MacCatalyst flaky, not MaxItemCount). The pattern above now only covers the 9 remaining unfixed VerifyShell_ snapshots*.

Remaining unfixed snapshots (9)

Split to separate Known Build Errors

• Issue16918Test → [MacCatalyst] Issue16918Test screenshot baseline flaky on all net11.0 builds #34624 (MacCatalyst flaky, unrelated to MaxItemCount)
• Issue18896Test → [Android] Issue18896Test screenshot baseline mismatch (MaxItemCount bottom nav change) #34625 (Android, same root cause but missed baseline update)

Fixed by PR #34601 (removed from pattern)

Resolution

Once PR #34601 merges and the remaining 9 VerifyShell_* snapshots are confirmed passing (or baselines updated), close this issue.

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1342062
Error message validated: [Snapshot different than baseline: (VerifyShell_IsVisible|VerifyShell_TabBarBackgroundColor|VerifyShell_TabBarBackgroundColorAndTitleColor|VerifyShell_TabBarBackgroundColorSetToNull|VerifyShell_TabBarDisabledColor|VerifyShell_TabBarForegroundColorAndTitleColor|VerifyShell_TabBarTitleColor|VerifyShell_TabBarTitleColorAndUnSelectedColor|VerifyShell_TabBarUnselectedColor)\.png]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 3/24/2026 8:07:14 PM UTC

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Summary