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