actually does anyone know if theres any feature in the upcoming patch that requires a new game to be effective? like updates on players' data?
Any database update (eg. league rule) require a new save to take an effect. Match Engine update, player progression - development rate etc is save game compatibility.
Currently, Czech League 1 has 3 subs out of 7 where IRL is 5 subs out of 11. If will update - correct this one; then require a new save.