I’ve kept all my gnome/gtk DEs KDE-free in my linux journey (I have massive trauma with baloo a decade ago that I’ve never recovered from). I know many Plasma users keep their own rigs gnome/gtk-free…
RULED OUT:
two flatpak browsers
any AUR install because I had the same in Cinnamon.
I’m getting the feeling its a process used by the Kernel in a Wayland environment and I can’t get rid of it.