[gameplay] Alistar bug? 5.16

So I main Alistar, and now that Alistar's Headbutt speed has been lowered, it's only normal to expect some fail combos. However, the strange thing about it is that when the combo does fail, the stun from Pulverize still goes off on the target, which means the Q is hitting, but not applying the knock-up. This is why I'm reporting this as a bug. It's still possible to land the combo as normal, but sometimes the interaction is very strange, where the knock-up does not go off yet the Q does hit and apply the stun. Rito pls fix!