Balloon ride broken on the Wandering Isle., in Quest for Undefined.

During the quest "The Suffering of Shen-zin Su" on the Wandering Isle, you and some accompanying NPCs are supposed to board a hot air balloon, have a conversation with the giant turtle, and float around the island until you see a crashed alliance airship.

The NPCs do not get on with you, so you only hear the turtle's side of the conversation.
The balloon does not go around the island. It just flies outward until it despawns and drops you past the fatigue zone. Then you die.

The quest can still be completed with some minor workarounds.
There doesn't seem to be a path back to the quest return if you revive at the graveyard, but you can hearthstone back and complete the quest as normal.