page moves in wikisource (probably specifically those in namespaces like "Author") to not get registered in Wikidata's job queue and thus items never updated.
I see entries in runJobs.log for wikisource page moves in the main namespace having an associated job in wikidata.
I suspect the issue might be with how these namespaces are handled.
Version: master
Severity: normal
Whiteboard: u=dev c=backend p=8 s=2014-04-01