This is an unfortunate situation. Players who do not start the match are excluded from most player prop markets, meaning any bets on these types of player props placed on players who come off the bench will be voided. If one of these players is included in a Same Game Multi, the entire Same Game Multi will be voided.
The Anytime Goalscorer market is the only player prop market that will not be voided if your player starts as a substitute and comes onto the field later into the match.