Some geometry glitch

[El Kameleon]

I found a glitch in the geometry, let my video do the explaining:
https://youtu.be/efsPBLpig-w

[Guest]

Same thing happens in the room with the computer that lets you lock/unlock rooms (to unlock the main security office) in Theta floor 2. Was hiding against the corner to the immediate right after entering the room to avoid the Proxy. Turns out I backed into nothingness and fell down into the void with the whole level fading away above me.