Sorry, but only posted the “status” in Screenshot_20251025_201155 image. However the rest of the command was similar and it had pl_PL.UTF-8 everywher (except for LC_ALL).
I also set it in (if memory serves me right): /etc/default/locale and used localectl set-locale
Sadly, after hours of trying to get this working I ended up trying other distro and everything JustWorked 
Alas: it’s highly confusing that almost all guides point to “just use YaST” while it’s gone from Leap 16 