I played the Legion campaign and did the quest about skull of the man’ari.
I was able to complete the quest normally, i.e. get all the sequences and the skull at the end. In the end, however, I didn’t take the portal, but wanted to explore the zone a bit. I got to the border of the zone (Felsoul hold) briefly transitioned to the next zone for a moment. I think Shalanar or something. After that I turned around immediately and rode back to the Felsoul hold. Suddenly my game was automatically closed and I had a disconnect. After re-entering the game, the campaign quest started again even though I already had the skull.
The portal that actually completes the quest and takes me away wasn’t there anymore either.
I also replayed the whole quest sequence, but I couldn’t loot the skull again since I already had it. But the whole thing was very strange.
Also, at the green lava barrier, I think that was step 7 or 8 in the quest sequence, a copy of Mephistroth remained. His health had dropped to 0. At the end of the last fight, where you loot the skull, he actually teleported away, but that one copy at the barrier stayed there.
After the final fight again, I couldn’t teleport away anymore because the portal wasn’t there anymore. So I used my Dalaran port stone and ported myself away. I believe the quest was completed after that.
There are 2 bugs I could encounter:
- The quest sequence restarts after you briefly leave the zone
- A copy of Mephistroth remained at the barrier, even he should normally teleport away.