Do you have the locale properly set up? During the update from KDE Plasma 5 to Plasma 6, zypper decided I don’t need any locales anymore so the entire desktop was a mess of english and czech.
Try running the command mentioned here: [HOWTO] being sure all language packages for your language are installed
Might be helpful to you. It certainly did help me. Before the fix, running zypper locales returned an empty table for me.