Master Yi's Q is not doing what it is supposed to do.

So recently, I started to play again, and I noticed that a lot of the time when I get killed it is because the effect of my Q (making you untargetable) does not apply. For example, you are fighting Garen , you are both on low HP. He starts to Q you, and you Q at the same time. He kills you but the cooldown on your ability has not reset (like it would do if you did not have time to activate it) and the animation for the attack has also activated meaning that the game bugged and that your damage did not apply. I don't know if it is only me, or that I am just slower, but if my ability does, (making me untargetable) Garen should not be able to Q me, and I should be able to Q him and kill him without him killing me. Or at least, the damage should be able to be applied anyways. I believe this is similar to the mundo bug where he had an infinite amount of revives when he threw his cutlass at the right moment giving him some health back. Riot, plz fix this, it is so annoying when you are on such a streak and you get interrupted like that. Thanks. One way of solving this is that any damage ability that is applied to at the same time that Master Yi is Q ing should get reset, and make YI truly untargetable