Entered a match anyway after I had cancelled the search
During a premier draft I was looking for a match but it took a while so I clicked cancel. I exited from MTGA to do something else, but decided to give it another try. I open MTGA to find I'm in a match and have already missed a turn. I of course go on to lose the match. Very frustrating that it exited the search yet started a match anyway.
Big Hack#89451 commented
It should also be clarified that cancel worked and I was back to the event screen.