[CI Failure] Flaky: MauiBuildQueueTests.CancelQueuedResource_CompletesGracefullyAndDoesNotAcquireSemaphore asserts exact exception type but sometimes gets TaskCanceledException instead of OperationCanceledException

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Build Information

Build: https://github.com/microsoft/aspire/actions/runs/35634736322
Build error leg or test failing: Tests / No-package tests (regular, Aspire.Hosting.Maui.Tests, Hosting.Maui, Hosting.Maui, tests/Aspire.Ho... / Hosting.Maui (windows-latest) / Aspire.Hosting.Maui.Tests.MauiBuildQueueTests.CancelQueuedResource_CompletesGracefullyAndDoesNotAcquireSemaphore
Pull request: #20279

Classification Analysis

The test asserts an exact exception type (OperationCanceledException) but the code path can non-deterministically throw the subclass TaskCanceledException depending on timing of the cancellation source. The PR does not touch any Maui build queue code, so this failure is unrelated to the PR's DCP/Orchestrator changes.

Failure Information

Test output

Error:
Assert.IsType() Failure: Value is not the exact type
Expected: typeof(System.OperationCanceledException)
Actual:   typeof(System.Threading.Tasks.TaskCanceledException)

Stack Trace:
at Aspire.Hosting.Maui.Tests.MauiBuildQueueTests.CancelQueuedResource_CompletesGracefullyAndDoesNotAcquireSemaphore() in D:\a\aspire\aspire\tests\Aspire.Hosting.Maui.Tests\MauiBuildQueueTests.cs:line 543
   at Aspire.Hosting.Maui.Tests.MauiBuildQueueTests.CancelQueuedResource_CompletesGracefullyAndDoesNotAcquireSemaphore() in D:\a\aspire\aspire\tests\Aspire.Hosting.Maui.Tests\MauiBuildQueueTests.cs:line 552
--- End of stack trace from previous location ---

Description

Flaky: MauiBuildQueueTests.CancelQueuedResource_CompletesGracefullyAndDoesNotAcquireSemaphore asserts exact exception type but sometimes gets TaskCanceledException instead of OperationCanceledException

Type: flaky-test

Occurrences

Date	Build	Job	PR
2026-09-21	35634736322	Tests / No-package tests (regular, Aspire.Hosting.Maui.Tests, Hosting.Maui, Hosting.Maui, tests/Aspire.Ho... / Hosting.Maui (windows-latest)	#20279