[Potential cosmetic drop bug? Dev response would be nice]

I have been playing D4 since S1, and I have spent a lot of time in nightmare dungeons in purpose in order to try and farm the Butcher in order to get the mount barding to drop from him. I understand that it is supposed to be a low drop rate, however I am starting feel like there may be something wrong. Here we are in season 8 and I have killed the Butchers over 200 times so far this season alone. I have also had a similar experience with the Ashava barding. With no way to submit a ticket in the game (like WoW), and be able to ask a GM from within the game, I am forced to make a post on here and hope that it grabs the attention of a forum developer. The question that I have is this.

Is it possible for a loot drop to have been recorded (like a barding), and it no longer being able top drop from then on, even though one may not actually have the cosmetic?

Thanks for any help with this topic.