With the .8_31 update, I'm experiencing a very weird bug with manhole covers. When I open one, it makes the sound but doesn't move visually. When I close it again, it grabs a random nearby object and stretches it!
This happens with both manhole cover styles. If I remove the manhole cover from the world, the stretched object goes back to normal I've been able to recreate it in multiple worlds, so I don't think it's because of a corrupted world.