added patch to solve ThemeRegistry
Added the following patch https://www.drupal.org/project/drupal/issues/3460773 that solves
Argument #2 (closed) must be of type array, null given in array_diff() (line 702 [...] core/lib/Drupal/Core/Theme/Registry.php)
The patch has been applied before succesfully to few sites including:
Edited by Lorenzo Del Pianta