Though it is not really a bug, the one thing that annoyed me is how the shield to the last boss's room doesnt drop after the room is cleared.
The group I was in had someone who got stuck outside. We still completed the whole thing with 4 people (it was really fun ), but when the mission ended, the guy that got stuck outside had one of the drops from the boss, but still couldnt get through the shield to get it.
Not a huge deal, just dont think it's right. But if you want the group to be perfect to get the drops thats fine with me too. I just figured, queen/rebecca (random name) is dead, so why keep up the shield :p