I recently got disconnected from a 1v1 quick match. I checked my match history and this game was never recorded. I was under the assumption that disconnects were counted as a loss. However, this doesn't seem to be the case.
How are disconnects handled?
I remembered my opponents name and looked up their match history on sc2ranks.com. I was able to confirm that a win was recorded for them. However, the match is still missing from my match history after nearly 24 hours and my w/l has remained the same.
The match history is still missing after two days and I'm going to assume that it will remain missing. Do note that my opponent was awarded a win. This is either a bug or a decision the system made due to some unknown reasoning.
In the majority of cases, it should be understood that a disconnect is counted as a loss.