Created attachment 149446 [details]
Bug displayed with systemsettings

SUMMARY
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On Wayland, plasma ignores the minimum window size rule. 
In other words, manually redefining the minimum size is not possible, or rather it doesn't work.
On X11 it works as intended.

example attached.

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STEPS TO REPRODUCE
1. Start plasma with wayland
2. set a minimum window size rule for systemsettings -> example 0 width 0 height
(systemsettings used as example, works for every application with a fixed minimum size.)
3. try to resize smaller to than the default minimum size

OBSERVED RESULT

Window doesn't resize smaller than the default minimum size

EXPECTED RESULT

Window resizes to set minimum size via rule.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch / KDE
KDE Plasma Version: 5.24.5
KDE Frameworks Version: 5.94.0
Qt Version: 5.15.4