Steps to reproduce the issue

Add a wrong password for the DB user in the installation process.
Wait for the error message "Could not connect to database"

Expected result

Error message and try again.

Actual result

A screen full with error messages from XDEBUG and a halt.
Restart only possible after removing the configuration.php
After that I started new, entered a correct password and the installation ended as normal.

System information (as much as possible)

Got this today (Jan 11) by accident when installing the version available for J4 new Media Manager

Windows 10, XAMPP, PHP 7.04

Additional comments

I had a feeling that I entered a wrong character in the password for the DB user so I waited for the retry.