I was in a match (2e8d489a-d386-4914-a99c-2c4e3daa5cb2) in competitive. Half way through the match, 4 opponents disconnected. At the end of the 4th round (5v1 at the time), we saw the "Victory" screen and the game did not progress into the 5th round.
Everyone sat in the server for several minutes until it was obvious we wouldn't be able to play anymore. Now, when I try to join a comp match, I'm unable to play as it rejoins the existing broken match.