Akali's W cancel auto attack

As an Akali main I noticed that her W cancel commands after rework. If I try to hit Q on someone, right click on them and then try to close the gap with W to proc it, she just cancel AA command and stay in place. Same thing with ganks, right click to your turret then W to close the gap, she stay in place. It's not that important in scenario 2, but in first one to quickly proc the Q, it's a big deal. My question to someone from Riot is, does AA cancel with W is some balance thing to prevent a quick Q+AA combo, or just a bug ?
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