RenameTagProducerTests.CSharp_FixupSpanDuringResolvableConflict_NonReferenceConflict Fails

[Test Logs](https://dev.azure.com/dnceng/public/_build/results?buildId=126806&view=ms.vss-test-web.build-test-results-tab)

```
Assert.Equal() Failure
Expected: WhereSelectEnumerableIterator<TextSpan, Span> [[173..176), [266..269)]
Actual: List<Span> [[173..176), [266..269), [266..269)]
```