Hey
I wasn’t able to reproduce this issue. I attempted creating a new GameInstance blueprint, a new GameInstance class, and a new blueprint derived from new GameInstance class, and in all cases game did not crash. Can you attach crash log and dump file from project after this crash?
If you are only using a C++ class derived from GameInstance, it won’t show up in Saved > Cooked. If you create a BP derived from your GameInstance class, that should show up as expected. Let me know if that’s not happening.