I never claimed the lore for the corridors of time when i did some of the puzzle runs from a few weeks ago, and now that the corridors are gone it looks like the lore book also disappeared with it making it impossible to claim those lore triumphs. While i'm not hung up about the triumphs themselves, the "unclaimed triumph" indicator still exists on the lore section for me but can't be removed since those triumphs can no longer be claimed