Has an AFL game ever ended 56-55?
Yes. AFL has seen a final score of 56-55 3 times. It first happened on August 4, 1945, when Sydney beat Footscray, and most recently on July 27, 2019, when GWS beat Port Adelaide.
That makes 56-55 the 1534th most common final score out of 6,607 that have ever occurred in AFL. One point away, 57-55 has happened 2 times and 56-56 has happened 4 times. At one point the score disappeared for 63 years, between 1956 and 2019.