Specifically rooms with falling blocks that fall off screen could become unclearable in situations where the falling blocks get stuck on the room below. This room in farewell is a specific example https://cdn.discordapp.com/attachments/738100133757190275/739847407939878912/3572866580982d2f31365eb6c29b98c4.png
Another one causing issues (but not necessarily making the room unclearable) is 2nd autoscroller in 4A, where the moving block can get stuck on the fallen block.
In similar fashion, some screens in vanilla allow you to stick your head out of the top of the room, which is not possible if the generator places a room on top of it in a way that blocks you from going above the screen. This causes room 2b- lvl-08b to be a bit more tight and is likely to throw you off the first couple times you encounter it.
Specifically rooms with falling blocks that fall off screen could become unclearable in situations where the falling blocks get stuck on the room below. This room in farewell is a specific example https://cdn.discordapp.com/attachments/738100133757190275/739847407939878912/3572866580982d2f31365eb6c29b98c4.png Another one causing issues (but not necessarily making the room unclearable) is 2nd autoscroller in 4A, where the moving block can get stuck on the fallen block.
In similar fashion, some screens in vanilla allow you to stick your head out of the top of the room, which is not possible if the generator places a room on top of it in a way that blocks you from going above the screen. This causes room 2b- lvl-08b to be a bit more tight and is likely to throw you off the first couple times you encounter it.