A few nights ago (I think 3), I was playing in CCL with my team Uncommon Grass Hoppers vs. Pupok's Nurgle.
During the first turn of the second half, I got a sudden disconnect from the game. My internet connection was fine, so I restarted the game, which took longer than usual, but definitely less than 5 minutes. On entering the main menu, I was not given the option to rejoin the game. As normally, when that happens (which it sometimes does), I restarted the game again, but got the same result.
I then wanted to check whether the game was already conceded. The game has not appeared in my team's history, nor is it available on goblinSpy.