There appears to be a bug where you can step off the stairs while going up them before you fully step through them and the next room will load (or be half visible) but the collision appears to be of the room under it.

I took a video of it, how to reproduce it here.
youtu.be/Qwi1K7-7otw

[video]https://youtu.be/Qwi1K7-7otw[/video]

Oh there's tons of movement bugs - that code is just placeholder stuff that we did when we were talking about movement and collision. With the code the way it is now, you can step off stairwells, get stuck in walls - do just about anything.

- Casey