[GAMEPLAY]Braum Ult animation begins and goes on cooldown but doesn't actually activate

Playing as Braum I was jamming on R while I was hit with a stun from Pantheon and then a stun from Elise. In the linked video replay you can see my ult's animation start as Elise's stun ended, but I die before my shield slams back to the ground and the ult doesn't actually pop on screen. So I don't knock anybody up and I don't do any damage. However, my ult goes on cooldown and when I ping my ult to my teammates it appears as being ready. Not appearing in the video(but still accessible via my replay if need be) is that when I revive my ult is still on cooldown and unusable but pings as being ready.

I'm not aware of Braum's ult functioning as a channel. If champions die while channeling the ability will go on cooldown, but as far as I know Braum's R is ability with a slight animation delay(like most champion abilities), and if the champion dies during this delay the ability does NOT go on cooldown. The fact that the ability pings as being ready while actually being on cooldown makes me think this is a bug.