Thanks. I can repro - although I think the background option being there for episodes is probably a bug. We don’t appear to actually use it anywhere (I think clients look for the show art work only).
It’s not that I want this option, but rather it’s just something that I noticed is in the UI but doesn’t work. Personally I would be fine either way if it works or is removed.
I noticed this myself today. I recently realised that it’s possible to have season level backgrounds. For shows like American Horror Story this is very handy.
However, the background only stays when on the season level view, if you go into an episode within a season it then defaults back to the show level background and not the season one. Have tested on Web, Android TV and Roku clients.