Battle for Freljord In Game Quest Disabled?

So with my recent match, I was allied to Lissandra, and the enemy team had Ashe. For some reason, when both of them got the total or exceeded 20 kills/assists, the event never triggered.

I believe Lissandra first exceeded, then the enemy Ashe kinda died in a teamfight and got some assists from the fight which got her to 20 or more.

I was hoping that in her resurrection, the event would finally trigger, but it didn't happen at all.

Is the event bugged or something? or it's because of that situation?