1. Install clean installation of Ibexa DXP v3.3 or update it to the latest version. The required package is:

   symfony/expression-language v5.4.7
   

1. Try to disable any block under Landing Page Content Type form.

Result:
The following exception occurs:

Argument 2 passed to Symfony\Component\ExpressionLanguage\Node\BinaryNode::evaluateMatches() must be of the type string, null given, called in /var/www/33/vendor/symfony/expression-language/Node/BinaryNode.php on line 167

Expected result:
You should be allowed to choose any block/layout without an exception occurring.