Created attachment 184853 [details]
screenshot of monitor display configuration

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SUMMARY
I have 3 monitors and a kvm as a 4th.  The kvm is a mirror of the 2nd (primary) monitor.  The order the monitors show on top of display configuration is mon1, mon2, kvm, mon3.  when the kvm is enabled I cannot move windows with the shortcut from mon2/kvm to mon3, but I can move it back and forth between 1 & 2.  Note that I CAN drag the window propery between all three screens.  It is only impacting the "Move Window to Next Screen"  I would guess that it is "moving" it from mon2->kvm which IS mon2 thus never getting to mon3 with the shortcut.

STEPS TO REPRODUCE
1. 4 monitors with the 3rd being a mirror of second
2. try to use next screen shortcut to move window from 2nd(mirror 3rd) to 4th

OBSERVED RESULT
The window remains on the 2nd/3rd screen

EXPECTED RESULT
the window should move to the 4th screen as it does when dragging to the right

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 
KDE Plasma Version: 6.4.5
KDE Frameworks Version: 6.17.0
Qt Version: 6.9.2

ADDITIONAL INFORMATION
if I disable the kvm 3rd monitor then the next screen shortcut works correctly