Certain mobs not counted when killed in one hit

The mob ["Stone Drake" (42522)](http://wowhead.com/npc=42522) seems to not count towards kills when killed with one hit. If aggroed first with some kind of taunt (or just damaged without being killed), it counts properly.

Reported by [Hrubyduby](http://www.curse.com/users/Hrubyduby) in a [comment on the Curse page](http://www.curse.com/addons/wow/killtrack?comment=38).
