I’m not sure if this is common throughout runs or not, I haven’t had it happen in any of mine so far until now. I was soloing the dungeon for fun while waiting in queue. Got the 1st boss down to 1 hp, she did her Darkness Comes cast. I accidentally clipped it (even though my character was outside the bubble visually) and died. It’s been 15min and the boss hasn’t respawned.