so I looked at exotic Ingrams that xur or those from the season pass have to see what I could get and I noticed that the game is saying I own a good amount of exotics that I forgot I had, and I check my collection it said I didn't own them which was weird not long later I did the quest for the legend of Icarus and it says I don't own it in collections when its in my inventory nor does it let me put it in my vault only use it. So i concluded there was an issue with my game not recognizing certain exotics I own I checked online and it said that it might say I own something in the exotic Ingram preview if I have the ornament for it but I don't have any ornaments for the weapons it says I own that the collection says I don't own.
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It's a long known visual bug. If it's not in your collection you have not obtained it yet. The bug had no impact on your ability to receive it as a drop/reward.