Steps to reproduce:

1. Install fresh Ibexa DXP.
2. Create a new Site Access in the ibexa.yaml file with the following tree_root setting:

           test:
               languages: [eng-GB]
               content:
                   tree_root:
                       location_id: 42
   

3. Install the ibexa/compatibility-layer bundle (https://doc.ibexa.co/en/master/update_and_migration/from_3.3/to_4.0/#add-compatibility-layer-package)
4. Create any content under the Ibexa Digital Experience Platform folder (call it 'article').
5. Access the following URL: localhost/test/article.

Result:
One is able to access newly created content.

Expected result:
One should see 404 exception as newly created content is outside of tree_root scope of the test Site Access.