Kennen W Bug?

There's a bug on where, if you try to kill a minion with your W, and the minion dies while your W animation is still going off, your W is still put on cooldown. I don't know if this is intended, but it can really screw with in the early game. Most of your trades are based off of you doing your Q-Enhanced Auto-W combo, and if you don't have your W up, it can let the enemy laner engage on you easily, since your stun combo would be E-Q-Enhanced Auto, which would bring you into melee range with your laner, unless you use . However, you don't normally use in trades with your laner. This should either be addressed as intended to be in the game, or patched, since this can mess with your laning and get you killed, since the stun you would use to self-peel would bring you in melee range with the enemy. I know what I'm talking about, I've been a main for most of the time I've been playing this game, and it's screwed me before. Please, patch it or say "Yeah, we meant to do this." It's something small to patch, but it can make a difference.