Just what I said, here you can see it happening:
Around :27 you can see me stopping and asking myself, "Is this enough?.."
To which the answer was clearly, "No. We are only getting started."
And if while you clearly rush to fix this game breaking bug, also take a look at Sylas' W occasionally casting but doing nothing, it is still happening:
[ The ability goes into cooldown doing nothing at :09 ]