Steps to reproduce the issue

set
php joomla.php config:set error_reporting=development

locate error_log in folder

Expected result

No error_log should be present

Actual result

In error_log is

[08-Jan-2021 16:58:48 UTC] PHP Notice:  Undefined index: cors in /home/joomla4beta1/public_html/administrator/components/com_config/src/Model/ApplicationModel.php on line 734
[08-Jan-2021 16:58:48 UTC] PHP Notice:  Undefined index: cors_allow_origin in /home/joomla4beta1/public_html/administrator/components/com_config/src/Model/ApplicationModel.php on line 735
[08-Jan-2021 16:58:48 UTC] PHP Notice:  Undefined index: cors_allow_headers in /home/joomla4beta1/public_html/administrator/components/com_config/src/Model/ApplicationModel.php on line 736
[08-Jan-2021 16:58:48 UTC] PHP Notice:  Undefined index: cors_allow_methods in /home/joomla4beta1/public_html/administrator/components/com_config/src/Model/ApplicationModel.php on line 737

System information (as much as possible)

PHP 7.4.13 (cli) (built: Dec 23 2020 11:21:05) ( NTS )
Copyright (c) The PHP Group
Zend Engine v3.4.0, Copyright (c) Zend Technologies
    with Zend OPcache v7.4.13, Copyright (c), by Zend Technologies

Additional comments