After completing the First Exorcism quest, I went back to the Emissary to collect the reward. Naturally my character was full since I don’t have any vault space. So the weapon went to the postmaster. After collecting the weapon from the postmaster, the quest step remains. “Open the chest” but there’s no chest to open. And no progression. I would love to be told I’m just doing something wrong, but as it appears, the quest is bugged if you don’t have enough space on your person to collect the gun in realtime.