I have a gsync monitor and that seems like it might be part of the problem. When Nvidia introduced vrr for Wayland to their driver, my gsync screen started to have screen tearing. Disabling vrr in kde didn't fix it.
On Windows disabling vrr disables gsync on the monitor but not on Linux. It seems to work as intended on the cheap freesync (gsync compatible) monitor my mother uses but she was also on gnome but that's xorg thanks to gnome not adopting vrr yet.