I recently changed my guardian's appearance and switched around some armor ornaments. After changing my mind and attempting to go back, the previous ornaments I was using are now missing entirely. The ornaments are from the Pathfinder set, all armors are obtained and in my collections, I had even purchased the ornaments already but now the chest piece and gloves are missing their ornaments and not even a chance to buy them.
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Bungie is aware of certain previous season armor options not appearing in the transmog menu and is investigating.