Can't generate new username in Account Manager

[hammeractual]

Check the debugging logs

Version
1.11

Describe the bug
Can't generate new username in update account form when we update First name or Last name field, error shown "Uncaught ReferenceError: update_username is not defined".
Screenshot: https://pasteboard.co/Ir0OLE73cUlP.png

The error also shown in new account form although the username was successfully generated, with error shown "Uncaught TypeError: Cannot read properties of null (reading 'classList')".
Screenshot: https://pasteboard.co/vXFuB8XgoQap.png