Please do NOT tell me that this is intentional. I finally got Trophy of the Reborn Bonelord which are the cosmetic bonewings for your back under the cloak transmogs in your wardrobe. As soon as I got it, I used my transmog I had been waiting to use with it. The only thing that REALLY bothered the heck out of me is that my staff disappears from my back whenever I transmog the Trophy of the Reborn Bonelord.
If this is intentional, PLEASE change it. This completely ruins any excitement anyone has to use it with a transmog set. It’s just not worth it if you can’t see your staff on your back.