A guard sitting in the dark inside the vault does happen occasionally. (Any chair, even one in storage, is fair game for putting a stationary guard in.) Not new to this update but it is amusing when it happens. What are they doing in there? My favorite is when a guard ends up investigating into the vault, spots an unlit lamp in there and lights it up.
My current project is a level style with a lot of small buildings separated by narrow alleyways. It is necessitating some fairly large changes to how things are represented.