Ok and yes before anyone ask I have completed all associated questlines for both the Lore and the Exotic trace rifle (which is appearing to still be classified) but I have it equipped in game and the lore appears in game. The afore mentioned items are not appearing on things like DIM, Little Light, or even Bungie's Destiny 2 app. I don't know if y'all know about this issue?
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Classified items are not accessible via API. These will likely be declassified with a future update.