There are a few places in the second prison island building with the military bunks where the occlusion culling objects seem to be covering doorways, so that items can be in rooms but can't be seen from certain positions in the room, when they suddenly pop into view. Examples are the first and second doors on left on the ground level, the point where the hall branches to the 2 staircases upstairs, and inside the first room on the left on the top floor.