Since the HoT update there seem to be many instances in which you can get stuck inside the map architecture. For example, when Fort Salma was destroyed I got stuck inside the barrier in front of the gate after defeating the final enemy. However, this bug is avoidable by not going near said barrier.
Unavoidable is a similar bug at the end of “Into the Labyrinth” when all participating players are teleported into the nearest wall after the final cutscene, so that nobody can talk to Rox and finish the mission.
This bug is blocking story progress.
I have played that content just before the HoT expansion without any issues of that kind. So, whatever was done with that content during HoT: please undo it.
Edit: when you skip the cutscene you get teleported to a different location that lets you finish the mission as intended.