I haven't heard of this, what happens when you are "caught cheating"?
There are things like you'll still lose a fight and gain corruption if you try to save-scum during a boss fight. I've had a save screwed up so bad because I tried to restart during the campaign and instead of everything/everyone reverting, the game proceeds as if it was your original save minus story progression. There was also an error where I could not access the spare inventory in the room.
It's why I don't do anything to alter anything major when it comes to the game. I don't know the full extent of what Alan has implemented and screwing around too much seems like a bad time.
Also, is there any content after the yugioh D-rank bossfight? also also, is there unique game over if you lose the rank-up match? i gamed so hard she had no chance of winning.
She taunts you and vanishes.