Amumu Q Bug on Aurelion Sol hitbox doesnt register

https://www.youtube.com/watch?v=DBFLAJiNQy8

Amumus Q totally hits Aurelion Sol but the hitbox doesnt register for whatever reason.

Usually woudnt care to much to do this but i feel his q is a huge part of his kit and if that doesnt work then why play him.

I dont know if this happens to any other champion because this only happend to me once but its very concerning

Id get extremely tilted if this happened in a more serious situation