[Personal Story Bug]Underwater Enemies Glitch Through Walls
I too have experienced this same bug. Additionally, this bug extends to the “Risen” mobs at the end of the quest. When I died to them underwater and restarted from the checkpoint at the entrance to the sewers, they were in the entryway. I was able to kill the Risen Sharks and the Risen Scout using my “land-based” abilities as they never reset to their original location.
I got this issue as well, today.