Can't confirm for Titan or Warlock, but on my Hunter the entire Pathfinder armor set is no longer available for preview or use, regardless if the pieces were unlocked or not. This is especially confusing because just yesterday the pieces I had access to showed up on my unlocked ornaments list. Tried restarting the game with no luck. Something to note is that between yesterday when the pieces were available to today where they are now unavailable is that I purchased the Abyss Walker set from the Eververse, and I'm wondering if the Abyss Walker set overwrote/replaced the Pathfinder set on the universal ornaments list.