I’m having the same problem and believe that it is caused by the update to mesa 25.0.7-1 in F42 (and possibly mesa-vulkan-drivers specifically).
There are similar issues reported at the mesa GitLab - Making sure you're not a bot! and at the Arch Linux forum - Gnome Wayland stopped rendering window content / Applications & Desktop Environments / Arch Linux Forums
For now, I have downgraded mesa with sudo dnf downgrade 'mesa*' --refresh, which has removed the problem. As discussed above, you need to enter a TTY, run this command, and then sudo reboot.
P.S. Despite the appearance of the first link above, I am not a bot 