Created attachment 144763 [details]
Screenshot showing the overlapping of the displays

SUMMARY
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I have a big 4k display and a smaller FHD display on the right side.
Trying out Plasmas Wayland capabilities, i've set the scaling of the 4k display to 125% while the smaller on the right side remains at 100%.
When i now logout from the Wayland session and re-login using X11, both displays are "overlapping" somehow and i can't manage to separate them from each other.
The settings show that the display should be separated but in fact they aren't.
I guess that has something to do with the fractional scaling settings from the Wayland session that confuse Xorg.

STEPS TO REPRODUCE
1. Login using the Wayland session
2. Set the scaling of the 4k display to 125%, leave the other display at 100%.
3. Re-login with XOrg

OBSERVED RESULT
Both displays overlap as shown in the screenshot that I attached.

EXPECTED RESULT
This shouldn't happen.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 5.23.4
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION