I am running an up-to-date Tumbleweed KDE Wayland on a desktop PC with AMD graphics card. Night Light used to work for me, but sometime during the upgrade to Plasma 6 and a subsequent reinstall of the OS. Now it is disabled and there is no way to enable it: all controls in the System Settings are greyed out and the corresponding settings cannot be edited (see screenshot). Is this a KDE or Tumbleweed bug?