Child nodes have wrong URLs when the Document Tree is configured to show only the space nodes

Create two nested pages (non-terminal) under "Main" (or any other top level page). On a separate page use:

{{documentTree showSpaces="true" showTerminalDocuments="false" /}}

Expand the parent page (e.g. "Main") and check the URLs of the child nodes. The URL of the second child is wrong (as if it is a child of its previous sibling).