[CI Failure] Flaky: NewUpAndBuildStandaloneTemplateTests.CanNewAndBuild(aspire-ts-cs-starter, Net11) fails building generated project on Windows with preview .NET 11 SDK

[github-actions]

Build Information

Build: https://github.com/microsoft/aspire/actions/runs/33902845984
Build error leg or test failing: Tests / No-package tests (regular, Aspire.Dashboard.Components.Tests, Dashboard.Components, Dashboard.Components (windows-latest)) / Aspire.Templates.Tests.NewUpAndBuildStandaloneTemplateTests.CanNewAndBuild(templateName: "aspire-ts-cs-starter", extraArgs: "", sdk: Net11, tfm: Net10, error: null)
Pull request: #19243

Error Message

Aspire.Templates.Tests.ToolCommandException : Expected 0 exit code but got 1: dotnet.exe build ... /p:TreatWarningsAsErrors=true -c Debug /p:AspireUseCliBundle=false. Uses preview .NET 11 SDK 11.0.100-preview.6; unrelated to PR Kubernetes/Helm changes.

Description

Flaky: NewUpAndBuildStandaloneTemplateTests.CanNewAndBuild(aspire-ts-cs-starter, Net11) fails building generated project on Windows with preview .NET 11 SDK

Type: flaky-test

Occurrences

Date	Build	Job	PR
2026-09-04	33902845984	Tests / No-package tests (regular, Aspire.Dashboard.Components.Tests, Dashboard.Components, Dashboard.Components (windows-latest))	#19243

[radical]

[automated] The CI shepherd is watching this failure.

Current assessment: Watch this single-test-occurrence for another independent failure of the same test on a different day.

Evidence reviewed:

• issue:19941
• run:33902845984
• pr:19243

Evidence still needed:

• verified-fix-or-current-recurrence-check

Reassess when: After another independent failure of the same test on a different day or positive recovery.

No quarantine, retry, closure, or investigation has been started.