Just finished the story quest “Retribution”. For the last objective, killing the Plaguebringer, the majority of NPC’s from the orders stood on the field doing nothing. However, a small group of them stood right between the dragon's feet, in a large overlapping clump. Not sure if this is intended, but it struck me as odd that most of the NPC’s were doing nothing but their idle animation, while a handful were all so oddly located.
I was playing an Asura ranger. This bug is not blocking progress.