That's what I thought - but Charley & Dave made it sound like MLB gives the visiting team a new benefit
Rule 7.02(a)(5) (for what constitutes an official game)
Weather, if a regulation game is called while an inning
is in progress and before the inning is completed, and
the visiting team has scored one or more runs to take
the lead, and the home team has not retaken the lead;
So last night's game was called after the top of the 6th. If the Yankees had scored one run in the 6th to make it 4-3 Yankees, the game would still have been suspended because the Nats didn't have a chance to retake the lead. If the Yanks had been up, say 4-3,
before the 6th inning started, it would have been an official game.