I wrote the post with translation, there may be errors. I am using Kubuntu 24.10. The title seems to indicate the problem. It does not always happen. But when the computer wakes up from sleep mode or restarts, most of the time the applications on the desktop are arranged in a single horizontal row. I tried to refresh the plasma cache, I even tried to re-download plasma. I even reset the operating system using a different USB and ISO before. So, definite and creative solutions are needed.
Yes, old problem - and they aren’t applications, they’re icons/launchers.
Hopefully it will be gone in Plasma 6.3 (so for Kubuntu maybe the next decade 
) in a month or three.
You mean this April, of course, right? 