Known Build Error: Blazor SimpleRunTests/BlazorBuildRunTest Playwright timeout on Counter click

[lewing]

Build Information

Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=1364085
Build error leg or test failing: WBT-NoWebcil-MONO-ST-Wasm.Build.Tests.Blazor.SimpleRunTests
Pull request: #126378

Error Message

System.TimeoutException : Timeout 30000ms exceeded.
  waiting for Locator("text=Counter")
    - waiting for element to be visible, enabled and stable

Build Error Classification

{
  "ErrorMessage": "",
  "ErrorPattern": "Timeout.*exceeded.*text=Counter.*visible.*enabled.*stable",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Notes

• Occurs on slow Windows Helix Docker containers where Blazor layout reflows prevent Playwright from considering the Counter nav link "stable" within the default 30s timeout
• Fix in Increase Playwright timeouts in Blazor counter test to reduce CI flakes #126488: increases timeouts to 60s and adds explicit WaitForAsync(Visible) calls
• Long history of similar Playwright timeout flakes: [wasm] Playwright failing #94240, [ci] Playwright test times out/fails because target closed #99961, [browser] Increase timeout and clean up after failed attempts of launching browser when testing #107865

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1364085
Error message validated: [Timeout.*exceeded.*text=Counter.*visible.*enabled.*stable]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 4/2/2026 8:58:59 PM UTC

Report

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
0	0	0