I read a while back in a bug report about broken ladders.
Each time I start my game The bottom ladder leading to my second floor breaks off.
Single player. Room it 2 walls high. Hatch it one tile away from wall, and has 2 ladders. One touching the floor, and the other leading from that to the hatch… the upper ladder stays in place. But the bottom one keeps crumbling,.
I can see it happen if I start the game facing the ladder.