After upgrading to 5.23.0, I am getting the error that my resource URL is not correct. Everything seems to be okay though.
In the admin section, the Civicrm Resource URL is [civicrm.root]/
In civicrm.settings.php:
$civicrm_root = '/home/myuser/domains/mydomain/private_html/sites/all/modules/civicrm';