Bug report: In New Game+, after completing the game by talking to the ArchMage, I unlock the "Impossible ending" by not having my corruption above 100. Then, I get told I unlocked a bonus room, but I get teleported out and then end up in the New Game+ special room, but I'm stuck in the wall and I can't get to the bonuses.
Here's a link to my savefile. Simply talk to the ArchMage to trigger the ending, and the bug.
https://drive.google.com/file/d/13axKqRIT_ow7SpJNose_NW83ReYzoY3m/view
EDIT: I played a bit further, getting myself to the 1st transformation stage before completing the game. Now, when ending the game, I get stuck in the Katrina ending sequence. Nothing triggers. I have a save as well, just talk to the ArchMage.
https://drive.google.com/file/d/1qWqIjVDromBq4dqmcJsHZHyX2f4jKjXj/view