I’ve experienced two maddening bugs doing runs this week.
The first was in Tazavesh hardmode wherein two people in our group had their extra action button disappear after picking up packages. There was a hotfix note saying this bug had been fixed but we experienced it after that announcement. Obviously this meant we were not able to complete our run.
The second bug was in Ara-Kara on the last boss. The root adds frequently just let people in my group go on a 10 Ara-Kara, without even being touched or interrupted. They would always let go just before the explosion of the boss’ ability and caused us to wipe many times. Every member of our group had this happen multiple times, especially our healer, and I had it happen constantly as a tank. Although the boss ability never did very much damage to me, it would kill the healer every time so this bug is very frustrating.
I noticed over the course of trying to complete the fight that I could reliably cause this bug to happen by using shield wall while rooted in a puddle. I asked my healer if he was using any defensives and he said he was not. Regardless I doubt it’s intended that using something like shield wall should make the add let you go during that mechanic.