SUMMARY
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I have 3 identical monitors and 10 desktops:
DP-1    DP-0    DP-2
      primary

I used to have my screens set to never turn off; but a few weeks ago, I  changed systemsettings->Energy Saving to turn them off after 20 minutes. After a period of time, usually the next morning, most of my open windows have migrated to DP-1 which is quite aggravating moving them all back to where I like them.Some windows which were spanning DP-0 & DP-2 end up with the portion which was on DP-0 now off-screen to the left of DP-1

 see https://bugs.mageia.org/show_bug.cgi?id=32950 for monospaced font for the following:
Before screens go off:
[    DP-1    ][    DP-0    ][    DP-2    ]
  W1,w2         W3,W4,W5   W6, W7       <-- W6 spanning DP-0 & DP-2

After screens come on:
[    DP-1    ][    DP-0    ][    DP-2    ]
  W1,w2
   W3,W4,W5
6, W7                 <-- W6 off screen




STEPS TO REPRODUCE
1. enable energy saving
2. resume system use after monitors have been off for a while.
3. 

OBSERVED RESULT
see above

EXPECTED RESULT
leave the app windows on the desktops/screens; don't move them  around.

SOFTWARE/OS VERSIONS
Operating System: Mageia 10
KDE Plasma Version: 6.0.0
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.2
Kernel Version: 6.6.18-server-1.mga10 (64-bit)
Graphics Platform: X11
Processors: 20 × 12th Gen Intel® Core™ i7-12700K
Memory: 125.5 GiB of RAM
Graphics Processor: AMD Radeon RX 6600 XT
Manufacturer: Dell Inc.
Product Name: XPS 8950

ADDITIONAL INFORMATION see also https://bugs.mageia.org/show_bug.cgi?id=32950