I think the reason it shows up, is because when you submit a page to a group, it creates a record in the "view_access" table, just the same as if you had shared the page via the Sharing screen. And the "Shared Pages" block is basically just listing the records in the "view_access" table.
I think the reason it shows up, is because when you submit a page to a group, it creates a record in the "view_access" table, just the same as if you had shared the page via the Sharing screen. And the "Shared Pages" block is basically just listing the records in the "view_access" table.