Did mythic Taloc the other night and found that if we wiped on the boss after the elevator began to descend, then the encounter would not reset and the doors would not reopen allowing you another attempt.
The only way we could fix it is to all exit the raid and reset the instance (and the trash). Now my guild isn’t real far into Mythics, actually we have only had a couple of attempts on Mother so far and this bug is just a real pita for a team that’s just getting into mythic Uldir.
Does it happen on normal or heroic Taloc? No idea. We haven’t stuffed those up since the first night we did the fights so couldn’t tell you.