After knocking the last player out, I still played one more round with all players KO’ed. I have video to show the bug. I just don’t know how to submit the video.
Cause?:
I think the last player force closed the game during the battle phase to cause this bug.
The moment a fight starts, it’s already resolved server-side
The next fight is already scheduled even before you enter the fight screen
If you concede in finals, the last player will still play the next fight that has been scheduled
So yeah, that’s what they did, but at this point it’s not really a bug since it’s as old as the mode 