Test Failure: System.IO.Tests.FileStream_Dispose.DisposeSuppressesStrategyFinalization

## Build Information
Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1573826
Build error leg or test failing: System.IO.Tests.FileStream_Dispose.DisposeSuppressesStrategyFinalization

## Error Message

Fill the error message using [step by step known issues guidance](https://github.com/dotnet/arcade/blob/main/Documentation/Build%20Analysis/KnownIssueJsonStepByStep.md).

```json
{
"ErrorPattern": "System.IO.Tests.FileStream_Dispose.DisposeSuppressesStrategyFinalization*",
"BuildRetry": false,
"ExcludeConsoleLog": false
}
```

### Known issue validation
**Build: :mag_right:** https://dev.azure.com/dnceng-public/public/_build/results?buildId=1573826
**Error message validated:** `[System.IO.Tests.FileStream_Dispose.DisposeSuppressesStrategyFinalization*`]
**Result validation:** :white_check_mark: Known issue matched with the provided build.
**Validation performed at:** 9/2/2026 7:12:02 PM UTC

### Known issue validation
**Build: :mag_right:** https://dev.azure.com/dnceng-public/public/_build/results?buildId=1573826
**Error message validated:** `[System.IO.Tests.FileStream_Dispose.DisposeSuppressesStrategyFinalization*`]
**Result validation:** :white_check_mark: Known issue matched with the provided build.
**Validation performed at:** 9/2/2026 7:12:09 PM UTC

### Report

|Build|Repository|Test|Pull Request|
|---|---|---|---|
|[1596529](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1596529)|dotnet/runtime|[System.IO.Tests.Enumeration.MatchTypesTests_Directory_GetFiles.OverlappingExtensions_AllMatchTypes_Comprehensive](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1596529&view=ms.vss-test-web.build-test-results-tab&runId=44076058&resultId=153551)|dotnet/runtime#133847|
|[1586491](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1586491)|dotnet/runtime|[System.IO.Tests.Enumeration.MatchTypesTests_DirectoryInfo_GetFiles.OverlappingExtensions_AllMatchTypes_Comprehensive](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1586491&view=ms.vss-test-web.build-test-results-tab&runId=43778208&resultId=154817)|dotnet/runtime#130050|
|[1573826](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1573826)|dotnet/runtime|[System.IO.Tests.FileStream_Dispose.DisposeSuppressesStrategyFinalizationAsync](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1573826&view=ms.vss-test-web.build-test-results-tab&runId=43363784&resultId=178324)||
#### Summary
|24-Hour Hit Count|7-Day Hit Count|1-Month Count|
|---|---|---|
|1|1|3|

Start with the Azure DevOps build 1573826 and the failing System.IO.Tests.FileStream_Dispose.DisposeSuppressesStrategyFinalizationAsync test result. Trace the test and its related FileStream disposal behavior, then use the reported failure to determine the cause; done means the test passes without the known-issue match.

Written by the indexing model from the issue text.