The current condition on the latest release of Confluence is restricted confluence-adminstrators members are unable to see the restricted page on page tree and recently-updated macro on the dashboard.

However, as per documentation

Users who are members of the 'confluence-administrators' group ('super-users') can view all pages regardless of the page restrictions. To be able to edit the page, you will need to remove the restriction from it first - go to Space Administration > Restricted Pages.

super users should be able to see that this page is exist, instead of throwing the following ERROR on the page tree

Unable to load page tree. It seems that you do not have permission to view the root page.