CP-Users - new admin-user password not updated in database

short description

When trying to change the admin-user password via the "CP Users" - section in the "System"-module it is not updated in the database. Manually injecting a "MD5"encoded password via bash-mysql works fine.

Interesting thing: Changing the admin-username via the "CP Users" -section works.

correct behaviour

MD5-password should be updated in system database.

environment

Server OS: Ubuntu/Debian
Server OS version: 20.04 (Focal Fossa) ISPConfig version: 3.2b3

If it might be related to the problem

insert the output of `nginx -v` or `apachectl -v` here
Server version: Apache/2.4.41 (Ubuntu)
Server built:   2020-08-12T19:46:17

insert the output of `php -v` here
PHP 7.4.3 (cli) (built: May 26 2020 12:24:22) ( NTS )
Copyright (c) The PHP Group
Zend Engine v3.4.0, Copyright (c) Zend Technologies
    with Zend OPcache v7.4.3, Copyright (c), by Zend Technologies

## proposed fix

your code

or attach a code file. Best is to create a merge request of course.  

## references

screenshots

## log entries

apache / nginx error.log lines (if related)