As the title suggests; the game does not remember my favorite card back and reverts back to the classic card back after I relaunch the game. But there is a catch as this only happens when I use The Shattering (Deathwing Card Back) and Stolen Thunder (Thunder King CB) as the favorite CB, others work fine.
This began to occur a month back and none of the prior hotfixes or the updates to date fixed it. I searched the forums and nobody mentioned it before which is weird or they didn’t mind.
Edit: Fixed with the 22.4 patch…