Ever since I downloaded One UI 4 Beta, most of the themes vanished.
The only old themes that stayed are the ones I purchased. Every time I go on a theme creator's page, it's blank with no themes..
And my wishlist only has five themes instead of the plenty that I added there..
The only way for themes for 3.1 to show up for you is that you downloaded them to your phone because you purchased it or were trying it out before you updated to the beta
Also,once the developer starts updating their themes their page will fill back up for instance this creator page was blank the other week but he's updating his themes and they are slowly showing up again