Same. Really wanted to give Wayland a chance, but having artifacts on blurry windows where the cursor was is just too annoying for me. Plasma team is already aware of the issue but said it’s too huge of a change for 5.x
To be honest, X11 is not terrible, even with multiple monitors with different refresh rates. I’m running 2x 60Hz and 1x 144Hz without any problems on X11.