TW 20240924

Plasma (since the switch to 6) refuses to store/apply the Window Rules I
define.
I had set them (old version) to start my browser on virtual desktop 4, another
application to start iconified.  This had worked fine for years.

When I open System Settings->Window Management->Window Rules and select the
browser, it instead shows me Virtual Desktop:Apply Initially:All desktops.
(which it also doesn't do - it starts (only) on the current desktop)

If I change this to 'Desktop 4', then click 'Apply', close the settings, then
open again and check, it is back to 'All desktops'