TAEB had a level where there was a boulder on the upstair, and from that point on, it would never go back up and finish exploring a level after checking out what was on the other side of a downstair that it found.
My guess is because it wants to finish exploring the level above the boulder, but can't get there, so it just gives up on trying to explore levels other than the current one altogether.
TAEB had a level where there was a boulder on the upstair, and from that point on, it would never go back up and finish exploring a level after checking out what was on the other side of a downstair that it found.