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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Can confirm, having completed spire of the watcher on Eternity difficulty solo, I was able to collect rewards from 2 chests however did not reward the triumph for solo completion for the WANTED title. This should be added to the bug list.