Sounds like: 2292321 – gnome shell wayland sessions crash when any app is launched
Try dnf downgrade mesa*
Then reboot and see if that resolves the issue. With KDE, using SDDM you get a black screen. Hopefully, they’ll get this resolved soon and pushed to stable.
If that is indeed your issue, you’ll need to stop updating until it’s fixed or place an
excludepkgs=mesa* in your dnf repo files.