I found two bugs yesterday in the debug menu on the expies yesterday... I'll try my best to word this out lol.
When you try to use the mapgen/map editor to spawn a house or something, you can't press m to move around.
Another thing I found was that you couldn't contain liquids in containers when you wish for an item, I tried to spawn in some diesel but I couldn't contain it. I'd press F and it would just bring up the search thing. (Updated from 6300 to 6305 and you can contain again, still can't move around the map editor with m though.)