[Lulu/Miss Fortune] Ally Miss Fortune Ult interrupted by Lulu's Ult

Was playing this bot lane with a friend and we had this occur not once but three times. It caused several fights to end badly (although we won) because If you ult as Miss Fortune and a Lulu ults you, it will cause MF's ult to cancel. We did not test this with any other channeling champions so I'm not sure exactly who the bug is originating from.