Last modified: 2013-06-14 16:00:10 UTC
In this edit the gallery change wasn't intended by the user: http://de.wikipedia.org/w/index.php?title=ISA_Internationales_Stadtbauatelier&diff=next&oldid=119455441 I assume it happened because the tags don't match in casing - one is Gallery and one is gallery.
Yes, this is a known bug in Parsoid - merging with that one. *** This bug has been marked as a duplicate of bug 49525 ***