Bard Q reacts with Elise Cocoon for stun (GAMEPLAY)

I recently played a game where the enemy jarvan attempted to blow up my adc. Elise shot her cocoon while I shot my Q (playing as bard) at jarvan. I play bard quite frequently and understand the animation sound when his Q connects for the stun. If the Q doesn't connect, you will see it go through the enemy champion and the animation sound will not be the same. Fast forward the clip linked to 30 seconds. If you pause/play the video and break it down, you will see there was nothing before Jarvan or after him for it to connect to. No minions in front of him or behind him, no enemy champions in front or behind him. The only thing was the elise cocoon that was striking/seconds from striking Jarvan. Listen closely and you will hear the Bard Q land and stun, and there is nothing going through him. I do not know if projectiles like elise cocoons count as something a Bard Q should root to, which is why I am posting this as a bug. I hope the video and this explanation will help towards figuring something out.

Update: Forgot to note that the cocoon does land, I know this. Im simply stating that the Bard Q interacts with the cocoon.

Thanks for taking the time to read this Riot and look into it.

Cheers,

Column34