Steps to reproduce:

1. Clean installation of Ibexa DXP.
2. Create en Folder under Ibexa Digital Experience Platform folder, remember its Location ID, create any other Folder on the same level.
3. Add the new site access with the location from the previous step:

           en:
               languages: [eng-GB]
               content:
                   tree_root:
                       location_id: 61
   

               page_builder:
                   siteaccess_list: [site, en]
   

4. Click on second folder in the Content Tree.
5. Observe the link to the en site access under the Page navbar.

Result:
The URL doesn't take 'tree_root' into consideration. The observed URL is:

http://localhost:8001/admin/page/preview/62/eng-GB/9/en

Expected result:
The URL takes 'tree_root' into consideration. The observed URL should be:

http://localhost:8001/admin/page/preview/61/eng-GB/1/en

So it should include ID of en folder.