I've only played one 7 hour match so far so can't confirm if this happens every time, though at the end of my first play-through with TEC Loyalist vs Advent Loyalist, they surrendered and I decided to keep playing (because I enjoy total annihilation of the enemy), though the "Victory!" chant played continuously.
I ignored it for about five minutes, but after that it was just super annoying so I quit out satisfied that I had at least won.
