Looked at transmog for the first time today, aside from missing items I noticed some items just have the wrong textures, in particular the T7 25man sets including for example the chest piece and boots have some random texture instead of the T7 texture.
Honestly this version of transmog is trash compared to the retail version it is based on, I don’t understand the effort to change it to the retail version and then downgrade it anyway, but worse is when items show up with different textures than they originally had, making some matching sets (like T7) impossible.
Edit : Update in MOP Classic August 2025, the bug is still present, still can’t use T7 25man transmog.