REST page creation fails to set parent

Creating a page via a REST PUT generates a new page in the correct place, but it does not get its parent id set.

While the page will appear correctly in the web view of ?viewer=children, it will NOT be enumerated by the REST action /children on its parent.

Marius says "The page "children" REST resource is probably using the parent-child hierarchy which was deprecated in favor of the nested-pages hierarchy starting with XWiki 8.2."