.Net/C# impersonation and sandboxing broken

[forderud]

.Net bug report: dotnet/runtime#96397

IMPACT: It's currently not possible to implement startup of apps in sandboxed processes due to this bug.

.Net runtime source seach

https://github.com/search?q=repo%3Adotnet%2Fruntime%20DuplicateTokenEx&type=code