Hello,
Did you find a solution ? I updated my project from UE 5.1.1 to 5.2.1 and this issue appeared. I checked all .ini files, made sure the right game instance was set, but no improvements. It’s strange cause if I try to cast to my game instance from the controller and print the name as a string after the cast, it works ! But no matter what, If I call an event or use a blueprint interface : no answer. I even tried to call it from the level blueprint without success.
If I try to open a map from the console : crash
It works in PIE, in the exported game but not in standalone mode 
I’ll post any update.
Thanks