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[release/3.1] WriteAsync may truncate data after Advance(int) #43124
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Backport of #62306
Customer Impact
Customer reported issue. This can result in corrupted data (missing bytes in the middle of a Read) when using pipes with a mix of
GetSpan()+Advance()andWriteAsync()Testing
New test was written for the scenario, current test coverage gives high confidence no regressions will occur.
Risk
Low. The fix is well understood and very little code change.