The game didn't end after the enemy team agreed to a surrender. PATCH 7.24
I was playing a game as Draven and enemy team "surrendered". When they finished voting for a surrender in the chat it said that 4 players agreed to a surrender. The game didn't actually end. We had to destroy Nexus because surrender was bugged so the game didn't end after they voted for a surrender
Here are some pictures of that game: