Windwall / Kennen interaction bug

This is a bug between Kennen and Yasuo's Windwall.

Today while playing against a Kennen in midlane I proceeded to attempt to block his empowered Auto Attack from his(Kennen) W's Passive, which for those who are unsure of to what that is, it places a mark of the storm on you and applies an empowered burst to his basic attack.

Let me start off with saying the empowered auto attack does indeed get blocked and negates the damage from it and the mark on Yasuo, however the stacks on Kennen stayed. He was able to freely auto attack me right away and proc the mark on his first auto after his last one was blocked.

I feel like this is a bug in the coding for his stacks and that they should be dissolved if the auto attack is destroyed by braum or yasuo's wall. I have had the same bug with Annie. Wind Wall her Q when she has her stun stacks, and the stacks are not used even though she uses her ability and it and its damage are negated. She even loses mana, but keeps the stacks for no reasonable purpose.

It feels like a lapse in clarity. When I block something with the wall it should destroy the projectile and its effects, not pick and choose that only certain projectiles lose their effects and personal buffs tied to it(Lucians passive for example, is used when blocked by the wall, unlike kennen's W passive or Annies stun stacks when she attempts to Q the windwall.)

If anyone else has experienced this it would be great to get feedback or more light to the bug so it can be fixed.

Thanks for reading, have an awesome day on the Fields of Justice!