Last modified: 2014-11-11 06:46:00 UTC
This was seen in revisions prior to https://en.wikipedia.org/w/index.php?title=Wikipedia:VisualEditor/Feedback&diff=561926823&oldid=561926781 and fixed in that revision. For a reduced testcase see [[testwiki:Section edit links bug2]]. The cause seems to be the unclosed {{. Of course, this is broken wikitext, but the parser seems to be able to handle it fine (other than leaving out section edit links). Sorry I can't be more specific.