player gets way to many cards and I dont know why pls help

backend/requests/blackjack.http

@@ -5,3 +5,8 @@ Content-Type: application/json
 {
   "betAmount": 1.01
 }
+
+###
+POST http://localhost:8080/blackjack/52/hit
+Authorization: Bearer {{token}}
+

backend/src/main/java/de/szut/casino/blackjack/BlackJackGameController.java

@@ -43,7 +43,7 @@ public class BlackJackGameController {
         // TODO validate that hit is a valid action
 
         blackJackService.hit(game);
-        return ResponseEntity.ok().build();
+        return ResponseEntity.ok(game);
     }
 
     @PostMapping("/blackjack/start")

backend/src/main/java/de/szut/casino/blackjack/BlackJackService.java

@@ -6,6 +6,7 @@ import org.springframework.stereotype.Service;
 
 import java.math.BigDecimal;
 import java.util.ArrayList;
+import java.util.List;
 import java.util.Optional;
 import java.util.List;
 import java.util.Random;
@@ -52,10 +53,9 @@ public class BlackJackService {
 
     public BlackJackGameEntity hit(BlackJackGameEntity game) {
         CardEntity drawnCard = drawCardFromDeck(game);
-        ArrayList<CardEntity> playerCards = (ArrayList<CardEntity>) game.getPlayerCards();
+        List<CardEntity> playerCards = game.getPlayerCards();
 
         playerCards.add(drawnCard);
-        game.setPlayerCards(playerCards);
         blackJackGameRepository.save(game);
         return game;
     }