PHP warnings in Installer on PHP 8.1

Warnings during installation:

PHP Warning:  Undefined variable $config_dir in /tmp/ispconfig3_install/install/lib/installer_base.lib.php on line 2190
PHP Warning:  Undefined array key "master_port" in /tmp/ispconfig3_install/install/lib/installer_base.lib.php on line 3381
PHP Deprecated:  str_replace(): Passing null to parameter #2 ($replace) of type array|string is deprecated in /tmp/ispconfig3_install/install/lib/installer_base.lib.php on line 3381
PHP Warning:  Undefined array key "master_port" in /tmp/ispconfig3_install/install/lib/installer_base.lib.php on line 3408
PHP Deprecated:  str_replace(): Passing null to parameter #2 ($replace) of type array|string is deprecated in /tmp/ispconfig3_install/install/lib/installer_base.lib.php on line 3408