Comments - Upgrade from old Mysql install to recent Mariadb.
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This doesn't help: I still have to go into the application, find where it stores the password and then change it to the new password, or copy the old password into the commandline you're giving. :-(
OK. Maybe it helps a little bit. I could find a first application, extract the password, change the password to the new format for testing, and then I'd know that on D-day I can dump the database, and import it into mariadb.
Testing: So your first commandline gave
and then I tried:
So. All users are already on mysql_native_password.