Completed the spire of the watcher in rite of the nine solo. Final chest did not drop anything, quests did not complete the final boss check off, and end screen showed 0 damage and kills in final encounter
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Same for me. First time solo explorer, no completion. Second time it worked. It seems like a random bug. After completing the quest, I got a zero power shiny wilderflight from the eternity chest for my trouble. I think the Emissary came back to troll us.