(Gameplay) Kha'Zix isolation bug

if Kha'Zix tries to do his WQ combo against for example Raptors and every small Raptor dies to your W, your Q doesn't benefit from its isolation bonus. So the problem is that the game needs like 0,2s to realize that an enemy is isolated. This bug has a 100% reproduction rate. I cannot even burst a mage who is standing next to a caster minion with my W E Tiamat Q aa combo because i can't get the isolation bonus.