We have run EE ADQ twice in the past week, and the end boss Queen Lailat bugs out in the last summoning circle area - we defeated Lailat, but she then revives at 0 health and becomes undefeatable (she just remains at 0 health but continues attacking).
The quest does complete, but there is no end chest.
We were considering maybe it is because we killed her too quickly? We will have to try again and slow down the dps to see if it bypasses this bug, but was wondering if anyone had any insight into this?