So I managed to get the whole Optimacy-Eververse set for my Warlock in season 7. Knowing that they'd be converted into ornaments, I destroyed the pieces. Now I have the season 7 optimacy armor set unlocked in my collections -> armor -> groups, but I didn't get the corresponding ornament in my collections. At first I thought it didn't unlock, but that's not the case. I am apparently able to apply the ornaments to my armor, but it isn't registered in the collection. I believe this is due to the fact that there are 2 Optimacy-sets (Season 1 and 7) but only 1 ornament set from season 1 visible. TL;DR: I have access to the ornaments, but they are displayed incorrectly in collections. If this is a known issue (might be, same thing happening with some armor-mods) you can just remove this.