SUMMARY

STEPS TO REPRODUCE

( Wayland Session )
1.  Change "Peak at Desktop" applet to "Minimize all Windows"
2.  Open two or more applications
3.  Remember which application was first and second, and so on.
4.  So last opened app is now active.
5. Change active window to 1th app
6. Use "Minimize all Windows" twice, and make sure that others 2 apps windows are "behind" this activated. 


Behavior :
 
For example if u opened 6 apps ( from 1 to 6 in order ) . Then make sure that 2th app is active and 1th is behind .  Now if u use "Minimize All Windows" then it will be work, why ? Because app which was opened at last in row work with anything under. So if u take last opened app as active window and others behind. This will be work. If u that 6th app just minimize alone by button and left 5 apps in order from 5 to 1 ( 5th active ) then it still be working. But if u change order from 1 to 6 or 5 and so on, then "Minimize All Windows" won't work. 

I don't know why it works that way, but the problem always occurs 100% of the time. I reported it before version 5.24 and it was considered fixed. But from what I remember I tested the fix after the release of 5.24 and then 5.25 and now 5.26 and the error still occurs.



SOFTWARE/OS VERSIONS
Linux: 6.1.7-1
KDE Plasma Version: 5.26.5
KDE Frameworks Version: 5.102.0
Qt Version: 5.15.8