[Release/5.0] - Fix internal cache clean up for ComWrappers #53203
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Port of #52771
Customer Impact
Race condition between object resurrection and memory reuse of different
IUnknown*instance. This is a precise fix for microsoft/CsWinRT#762 and other related object resurrection issues we've been chasing for the past 2 months.Testing
Testing added in PR.
Partner team has run all C#/WinRT and WinUI tests and validated fix on all reported reproducing applications against a private build of runtime.
Risk
Low, it only impacts C#/WinRT scenarios.
Regression
This API was introduced in .NET 5 and is requested by the only official consumer.