Backdrops of specials

Why are episodes in a specials season always using the default backdrop of the show and not per episode backdrops as all of the normal episodes do?

Probably bc there is no backdrop/poster for special season for that show in TMDB so trakt falls back to the show backdrop/poster.

Specials are a whole different beast on both this site and on TMDB.

But those specials have backdrops