That makes sense.
I've experimented a bit more with block cutting. Cutting in the opposite direction to what's indicated gives a score most or all the time. On the other hand, cutting at 90 degrees to the indicated direction results in either a small number of points or no points (X shown). Stabbing a block made for cutting typically sometimes gives points. Cutting with the wrong saber consistently gives no score. I haven't yet tried cutting a block made for stabbing.