Xin Zhao passive stack bug

sorry my english is bad but i'll try my best to explain

When you do Auto attack + W + auto attack the last auto attack does not add passive stack

For example, let's say your xin zhao's passive stack is marked "1" on the interface You hit an enemy with auto attack, and the stack is then marked "2" You then hit the enemy with slash part of W and the stack is marked "3" you then hit the enemy with thrust part of W and the passive damage is added to the thrust and the stack resets to "1" After the thrust of W, an auto attack is done almost simultaneously if your xin has high attack speed. So your passive stack should now be makred "2" right? But no. It stays "1". The last auto attack does not add to the passive stack for some reason.

Hoever, this bug only happens when you have HIGH ATTACK SPEED If you have low attack speed, the last auto attack DOES add to the passive stack...

Please fix this issue Riot. My main is Xin and I believe this is quite a big issue... That lost stack could easily result in the enemy not dying you know..