Diana W bug with Yasuo Windwall

So in my many Diana games i have come to realize when you use your W on diana, the shields pop out and the ability does not go on cooldown unless the shields are popped or the timer runs out. and when you go against a yasuo, sometimes the W does not appear but the W seems to get blocked by the yasuo wind wall. The problem with that is when and if they are blocked, they are not put on cooldown and Diana is not granted a shield. I am not sure if this is intentional But i believe that something could be done to fix it by either putting the w on cooldown or leaving theshields to pop. was just curious to see if you had noticed it and if it was intentinal like arelian sol but hey man thanks for the mostly not broken game dudes. :)