A new sk156933: Wireless LAN configuration fails if it includes diacritic characters has been released. Afaik, Passwords are restricted to 7-Bit ASCII, minus some special chars, see sk109148: List of allowed ASCII characters for passwords on Gaia OS|.
sk156933 gives the simple fact that you are unable to set a password with diacritic characters (e.g. Umlauts) because your session will be terminated after clicking Apply and you will be logged out. But you can use them in autoconf.clish ! This will set a password with diacritic characters successfully. As a result, you are unable to edit wireless settings - your session will be terminated after clicking Apply and you will be logged out. After Reset to Default Settings, manually trying to set the same forbidden password makes that your session will be terminated after clicking Apply and you will be logged out.
Also see this list SMB documents for more.
CCSE / CCTE / CCME / CCSM Elite / SMB Specialist