I have the side quest “The Keening Spirit”.
When going to the designated position the quest NPC ghost is not present. I watched some videos of where it should be and what needs to be done.
Even after killing all the monsters inside the original quest area (the bigger blue circle) the ghost still not appear.
Things that may affect the side quest:
- Playing on Torment 3
- My main questline is at the “Catharsis” state, where I need to search for Eru with Neyrelle, as the main quest line made some restriction on the map recently too.
I have tried this quest on all difficulties i have open to me from normal up to pertinent and it wont show either. Im also past saving neyrelle
Guessing it’s bugged for a lot of people. I’ve tried numerous times from Hard to Torment 1. Fully cleared the area multiple times, tried at different stages during the campaign (I’m in the epilogue now) and it doesn’t seem to make a difference 
edit: I managed to complete the quest today after patch 2.0.3. However, I friend I was in Discord with said they still could not get the spirit, or the mob they needed to kill to spawn. So they’re still stuck.
Interestingly, I’m also further progressed in the campaign than my friend (they have seen Ah Bulan, but not Akkarat). So maybe there are issues depending on how far through the campaign you are?