Lulu's Q Doesn't work in URF

doubt it will be fixed considering urf disappears soon, but I assume Lulu's Q is coded such that you can only take damage from one instance in a given amount of time to prevent her Q from double dipping. Except, on URF, the cooldown is so short that I'll regularly get zero damage from the second cast, straight through a line of minions who don't die in 2 casts, straight through players who are clearly in it.