Bug 1: when you're being chased by SCP-106, he dissapears and will appear walking through the wall behind you (i know he goes through solid matter, don't reply about that)
Bug 2: SCP-173 can go through the ceiling from the other room before the maintance tunnel and attack you.
Bug 3:the elevator will get stuck, leaving the player inside the elevator of the maintance tunnel, unless you use noclip.
Bug 4:(Occassinly)the elevator's button will dissapear, which will leave the player inside the tunnels until SCP-106 attacks you.

Bug 1: When 0.6 was released, his pathfinding was scrapped, so he basically noclips.
Bug 2: I don't think he goes through the ceiling
Bugs 3 & 4: Known Bugs

Erm... When 096 chased me... i quickly went into the elevator... and then he fell through the map into the elevator and killed me. Dat 096.