Really? You call this a bug?
http://i.imgur.com/Vayrd0N.png
You guys do realize that this "bug" is a direct result of nerfing the speed of his W's shadow, right?
When Zed was released, if you were fast enough to press Q before your shadow landed, it would still shoot the Q without an animation. This "bug" has been present since Zed's release, and you've only noticed it recently because his shadow is three times slower than it was on release.
You could try fixing this self-made bug by increasing the shadow speed back to normal.
DISCLAIMER: I am not "bitching about a nerf to my main" I am calling out Riot for shitty balancing and "bug fixing" and giving them alternate advice on how to fix it.