Created attachment 144660 [details]
Screenshot of settings menu related to bug

SUMMARY
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Changing cursor theme and applying changes causes changes to only partially work. When hovering mouse over system settings or bar with system tray etc. the new cursor is show, but when hovering mouse over desktop wallpaper or dolphin file manager then old cursor theme is used. After reboot new theme properly works everywhere.
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STEPS TO REPRODUCE
1. Change cursor theme (for example from default dark to light), click button that applies changes immediately
2. Do not reboot - hover mouse over various elements (inside settings application, outside it etc. - try various different elements of plasma DE)
3. See cursor being inconsistent either old theme or new theme, depending on what kind of thing you hover over.
4. Reboot, see cursor inconsistency being fixed by reboot

OBSERVED RESULT
Inconsistent cursor looks - either new one or old one is seen depending on what is currently hovered

EXPECTED RESULT
New cursor theme being seen everywhere immediately after applying changes in settings

SOFTWARE/OS VERSIONS
Operating System: KDE neon 5.23
KDE Plasma Version: 5.23.4
KDE Frameworks Version: 5.89.0
Qt Version: 5.15.3

ADDITIONAL INFORMATION
None