I watched two games: in the first game, the one team had only one player at the sides and the possession was only 56-44 against him (his rival played a legal 4-3N-2W-1).
In the second game, one team had 3 players at the left and the possession was only 39-61 against him and he even managed to win a legal 4-4-2 (for this game i can give a screenshot).

So, they may have changed the rules about illegal formations