I triggered it on easy mode, using a build that is discard-based. I'm not sure of the trigger conditions for this bug, it seems like some days it triggers and some days it doesn't. On the other hand, I started the game with an archive of a previous game (I previously hit level 2 but didn't beat the girl, meanwhile, my last playthrough didn't), and I'm not sure if the cause of the bug is due to this archive that shouldn't have been saved?