I've created 3 worlds, and in each one of them, the dungeon was not there. There was a jungle in each one, just no dungeon. I'm pretty sure that glitch is already known though. Another glitch that has crashed my device, when you fall normally you fall at about 51 mph. But, if you hold a portal gun, you progressively seem to fall with no speed limit. I've fallen through and into blocks, and my Xbox One crashed. EDIT: Also, Split screen can be buggy, and usually the 3rd and 4th players can not see any text on screen, including pickup text and damage dealt.