Other bugs from playing a bit more and unlocking more achievements:
1. 9 Room on Language not opening (I was on Puss Mode)
2. Subtitles staying for too long
3. What looks like a Transit door in Language causing you to fall out of the map?
4. Interacting with the Transit Exit door in Language causing the scary ambience to start prematurely
5. Locked Doors in Language staying unlocked after using the keys on them
6. Smile Wolf's Hallway not opening (unless this part is being reworked; I don't think there was ever a Chalk Piece in there)
I haven't played through Language on any other mode yet but I'll get back to you if I find more bugs. Also to make you aware there's a massive oversight in vanilla AEwVS where Marzia can break you out of the starting room after 1 notebook is collected via melon piece
Also I have to say fantastic work so far on this project. I wish you the best of luck in unlocking the true potential of AEwVS!