Last modified: 2013-07-25 15:53:34 UTC
Addind a new header at a position where 3 newlines exists break the new header, see URL on testwiki and this one: https://de.wikipedia.org/w/index.php?title=Traverse_%28mechanischer_Tr%C3%A4ger%29&diff=120880693&oldid=114511530
There are two different parts to this. This is a known VE issue. Plus, there is a Parsoid aspect (enhancement) where we can be more liberal in how we handle "bad" html (see bug 50683). *** This bug has been marked as a duplicate of bug 51444 ***