We tried to fix an issue that was causing editor crashing in some customers and it had to do with the ForceRebuild.
You can cherry pick this CL if you want to see if it fixes your issues:
https://github.com/EpicGames/UnrealEngine/commit/21af5a74b9058d5be3a6c458191555da66f9f547
Alternativley people have reported rebuilding your DDC helps.