Lucian Q - Piercing Light Bug? - DMG not applied to target if killed during animation

Hello,

I started to notice this happening a while back when I played Lucian a lot (Season 4). I would be in the middle of a fight and want to use my Q, so I cast the spell, the animation goes off and it seems to hit the target, during the animation if you die, the damage will not be applied. The skill will go on Cool Down, so I feel like this is some kind of bug. Anybody else notice this in the past? I believe it still happens to this day. Maybe I am missing something to do with the cast animation time.

Thanks in advance!

*I will try to find a link for viewing pleasure