Updated desktop-backgrounds and f32-backgrounds are now in updates-testing: https://bodhi.fedoraproject.org/updates/FEDORA-2020-ed62604eca for KDE to show the new background we need a new kde-settings release upstream: https://github.com/FedoraKDE/kde-settings/ with all '31's changed to '32's, and then the package needs bumping to that version and all downstream-side '31's bumped to '32's. Marking this as blocking #1807342 , which is the tracker for F32 backgrounds not being shown in F32 images (and is a Beta blocker).
so KK merged a PR to do the 32 bump: https://github.com/FedoraKDE/kde-settings/commit/8689baeba545a6af5113eae7d56559111748ffa7 but didn't actually tag a release yet. I could always hack things up downstream, but it'd be neater if KK or Rex can cut a proper release upstream then build the package...thanks!
desktop-backgrounds-32.0.0-3.fc32, f32-backgrounds-32.0.0-2.fc32, kde-settings-32.0-1.fc32 has been pushed to the Fedora 32 stable repository. If problems still persist, please make note of it in this bug report.
We missed a bit :/ I'm sending a follow-up update. https://src.fedoraproject.org/rpms/kde-settings/c/76d97fef4c1c1448f609c309b0fbae57624dfdec?branch=master