I was trying to complete Cassandra's Companion Quest in Dragon Age: Inquisition: Unfinished Business. And i just killed the final target. But it did not register as him being dead... the quest did not complete all while i killed him and even picked up his loot.
I do not know what happened and will try again tomorrow to see if it was a 1 off thing. But i was very not-pleasantly surprised by it.