This is a bug in Sitefinity 3.5 . It is fixed for 3.6 where dynamic links are used. There, the URL address no longer looks like the following (3.5)
but it is now in the following format (3.6)
This passes the ID of the page instead of its relative path.
Our recommendation is to upgrade to Sitefinity 3.6 (Hotfix) in order to be able to fully use this functionality.
the Telerik team