Surrender bug?

On blue team, the chatbox showed the red team surrendered at 20 minutes, but the game didn't end. On the replay it actually shows that the red team surrendered 4/0, 4/1, and then the vote failing 3/2. I also have noticed problems in other games where a surrender vote before 20 minutes gets left up and bugs out after the game goes past 20 minutes. This happened in a normal game so the outcome doesn't really matter but it could very easily affect ranked games as well, when players think a game is over and it actually isn't.