Last modified: 2013-07-30 15:57:51 UTC
At line 138 of https://en.wikipedia.org/w/index.php?title=Wikipedia&diff=566045928&oldid=566042453 parsoid (presumably) has added nowikis around around a space following a HTML comment. I don't know whether the comment containing references is relevant or not.
*** This bug has been marked as a duplicate of bug 50758 ***