To reproduce

1. dotnet build

2. dotnet run --project Runner/Runner.csproj --framework net6.0

   Note : There are also targets for net5.0 and net48

3. Wait for the program to end.

If the issue happened you'll see something like

Assemblies were not equal!!!
asm1.GetHashCode() = 4032828
asm2.GetHashCode() = 37489757
Default ALC contains asm1 = False
Default ALC contains asm2 = True
Run 76 complete
Quiting because behavior was reproduced

If the issue doesn't happen, you'll see

Quiting.  The issue never happened

If the issue doesn't happen, there are some parameters you can tweak at the top of Runner/Program.cs that may make it easier to reproduce

Bug report dotnet/runtime#70742