I encountered 2 bugs in this story part actually.
1st and more important of the 2, I am not able to exit the quest after killing the last boss and viewing the final cutscene. I just get stuck at the “Search Chantry for survivors” notice. I watched a youtube video on this exact same story part and it showed the person getting the quest reward after the final cutscene. I did not and hence, am not able to proceed. I have tried to do this quest twice already, and both times am stuck at the exact same area.
2nd bug is that I am able to “fall out” of the entire map. On the left side of the portal in the chantry, it is possible to jump behind some rocks and fall out of the map. I have already sent a bug notice in game regarding this part.
Hope for this to get fixed soon.
Cheers!