Confrimed this bug is avaliable last run. The map is city center. The fireteam needs to jump into the lake during wave 12 and 22, it causes the ADU disappear. After that, you can just let the eneny destroy the ADU and you don't get back to the orbit. You will get the full reward after you beat the wave 50 boss. Please fix this asap. It will break this mode and there's no fun for players who enjoy the challenge.