Zyra's passive GAMEPLAY bug

It's very easy to come across this bug: after Zyra dies her passive channels for a short time (the flower grows), then she's ready to spit her thing. If you press any button (the passive triggers with QWER) while the flower grows the game gets it as an input. What happens is that Zyra won't shoot till the channel is finished (that's ok) but as soon as she finishes the channeling she will take the very first input you gave. I don't think this is intentional from you cause when Zyra channels the skill icons are grey like if you should not be able to use them but sometimes if I press something while they are grey, as soon as Zyra passive is ready she will autofire in the place you ordered 1 second before. It's annoying cause sometime you press a skill for error thinking you are still alive, then when you want to snipe a low health champion you see the missile go to the opposite part cause the game took the fire input while Zyra is still channeling.

I hope I explained myself clearly, you can easily guess English's not my first language,

if you have any question I'll try my best to answer.