On second boss, we didn't manage to get past them so no idea what bugs are next - during fight all were teleported out of map, when moving in this empty space with striped wall and cloudy sky above us, we were teleported back to dungeon, to first boss area. Tried to fight these three bosses 6 times, every time the same bug. We abandoned instance, thank you very much.
Kindly test stuff before publishing, yes? And find a fix with lightning speed, yes?