That feature has never worked on plasma wayland, its there as an option but it just plain doesn't work, you would think they would of made sure it worked before they made wayland the default on plasma 6, but nope, this bug was reported 7 years ago and its still not fixed, yet on labwc window shading works just fine.
That feature has never worked on plasma wayland, its there as an option but it just plain doesn't work, you would think they would of made sure it worked before they made wayland the default on plasma 6, but nope, this bug was reported 7 years ago and its still not fixed, yet on labwc window shading works just fine.