There was a blacked-out wall blocking the entrance to this room, I saw the known issues list said "invisible wall" so maybe it's different.

The audio cut out when I used the elevator to get a second level, for no reason I can figure. The only thing that fixed it was switching between the choices in Speaker Configuration in the Audio Options.Finally, confirming that bugs do spawn in walls. The robot's Q attack can hit them, maybe explosives too.