I never killed Jahan, but yes you're right it's not a gamebreaking bug. I can't use the skill at all for the amulet when it's in this state so I can't attempt a refill. I used spectral sight many times and I still can't see the portal at all. It would probably work with an older quicksave but I'd lose about 6 hours of progress if I were to do it and would much rather not. Thanks for the ideas!