I got the Xenophage quest from Eris and with it, the memory of Eriana-3 quest and I completed them both; looted the scavenger chest and gathered the letters but couldn't do nothing else. On the next week, I got the quest again but when I try to loot the chest, the yellow bar enemies won't spawn. Thus, I can't keep the track of the main story with Eris' nightmares and stuff. Does anyone have this bug or know a way to fix it? Thanks!
Are you playing on 2 platforms?
I play mainly on Xbox but installed New Light on PC after a recent graphics card upgrade. I only own Shadowkeep on Xbox.
I completed Eris quest while trying out the PC version but couldn't access the chest at the end. Had to go back to Xbox to claim the reward.
Might not be your problem, but might help.