I just got the same on a Raspberry (Pi OS Trixie with latest updates) even after reboots. I was about to uninstall/reinstall when I saw in the package manager a strange title for the mousepad software : ~Invalid UTF-8 name~ or something like that. So I didn't touch the package but instead I used the Pi Control Center to change my locale setting from ISO-8859-1 to UTF-8 then reboot then mousepad now runs OK.

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