Steps to reproduce:

• Start with clean Ibexa Experience v4.5.4

• Add landing page 'foo'
  
• Change the tree_root for site SiteAccess:
  config/packages/ibexa.yaml

  ...
          site:
              content:
                  tree_root:
                      location_id: 42
  

• try to edit landing page 'foo'

Result:
NoMatchingSiteAccessFoundException is thrown

Note:
Doing the same in v4.4.3 worked