Unexpectedly switching to Xfce4 did the trick for me. I suppose the whole issue was in Wayland. I guess that’s it for me using KDE. I had enough headache with it even before Plazma 6, but they decided to make things worse just for a laugh or I don’t know
Thank you guys for helping me out!
UPD. 14.03.2025
It wasn’t THE solution. The actual solution has been provided here:
