I’m a noob and the problem that I have is with some applications (for the moment are vlc and floorp), they leave a white trace of pixels on my screen between the maximized window and the panel, I’m using Plasma on Wayland Arch, my laptop is the Inspiron 15 3520, with an i3 12th gen, my screen is Full HD , 15.6" (1920 x 1080), 120 Hz, WVA.
I think I found it, my scale was 125%
This is a recently fixed bug with fractional scale factors; upgrade to 6.0.5.