Eh, I might have reported something that might be similar, a while ago.
Or I forgot to do so.
Basically having a plane fire a missile to something outside the map and not only hitting and killing that single unit, but other units that were off map too (retreated, or never placed on the map to begin with etc)
It rarely happens, perhaps once every 15-20 battles or so, if that.
I don't know if it is what the OP was talking about, but I guess I hope it is.
