I don't really see a problem/bug here. A WO is a WO. The minutes are meaningless, they are there only because minutes are needed for training and gameshape. There is no game, one team did not show up. The minutes need not add up. The simulation is there only for the injury risk. The design is quite clearly such that you cannot get 48 minutes for single position training (which works), and I expect everything else works as designed, too.