No custom background on analysis board/opening explorer

Title ^

It used to work, but a few months ago it stopped working. I assume this is a bug. Any way to fix it?

Same problem for me(also on the puzzle page) ,but honestly is not big deal.
Maybe they have other priority to solve...
Obviously i hope the fix it:)

I don't know if it's a bug, I think ever since the update with the puzzle dashboard, the custom background stopped working. It's not much of a big deal, though.