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Port .NET 5 fix for reverse P/Invoke marshalling of structs. #28117
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Fixes dotnet/runtime#45637
.NET 5 PR dotnet/runtime#32034. This fix represents a minor and supported change in the mentioned PR.
Customer impact
Customer reported issue dotnet/runtime#45637.
Regression?
Yes, introduced in 3.0 with the reconciling of marshalling logic.
Testing
I have verified the user's scenario. This fix has been in .NET 5 for about a year and doesn't exhibit the failing behavior.
Risk
Medium. This area is sensitive and even though the code has been in .NET 5 there is a possible culmination of other non-obvious changes that could be missing - this is speculation based on experience in the marshalling area. @jkoritzinsky or @davidwrighton may be able to provide a more accurate risk assessment.
/cc @jkoritzinsky @davidwrighton @elinor-fung