https://bugzilla.wikimedia.org/show_bug.cgi?id=55033
--- Comment #1 from Kunal Mehta (Legoktm) legoktm.wikipedia@gmail.com --- Since r7744 subpages are already recognized by the {{documentation}} templates but just ignored and not placed there. Maybe some wikis aren't in the moved_links dictionary of interwiki.py. Please feel free to submit a patch - or if not, give us a hint which language entry is missed at that table.
btw I guess there is a patch for placing iws and in few month (I don't believe) we should get wikidata.