Fixed in r47127 and patched in to Wikimedia. wfMsg() should never be used to fetch a message destined for wikitext, because this leads to double-parsing. Use wfMsgNoTrans() instead.

The problem in this case is that the cite error contained a category tag with a sortkey of {{PAGENAME}}. When expanded by wfMsg(), this gives you the name of $wgTitle, which is incorrect in runJobs.php. The fix is to use wfMsgNoTrans(), leaving the {{PAGENAME}} tag intact, which is then expanded to the correct title when parsed by recursiveTagParse().

Cleanup script done.