Ekko's ult allows him to die after the game is over?

[GAMEPLAY] Ekko is able to die after the game is over

I just played a bot game with Ekko. I just hit 6 as we were destroying the nexus. I used ult, nexus died, victory Screen, Ekko has been Slain. I think somehow using ulti as the nexus died got rid of the invulnerability as I was not invulnerable before the ult. I don't know much more. I only got it in 1 game.

If anyone can replicate this much thanks. This bug doesn't really affect anything but I wanted to report it anyways.