为什么我的代码部分无缘无故地只运行了几次？

问：

我刚刚开始学习python，并试图编写一个非常简单的Black Jack游戏版本。代码似乎运行良好，但有时它会在打印“Now dealer moves”后停止，没有错误消息或原因。

from random import choices, choice
import inquirer
new_game = True
while new_game:
    cards = [11, 2, 3, 4, 5, 6, 7, 8, 9, 10, 10, 10, 10]
    player_hand = choices(cards,k=2)
    dealer_hand = choices(cards,k=2)
    player_sum = sum(player_hand)
    dealer_sum = sum(dealer_hand)
    print(player_hand)
    print(dealer_hand)

    print(f"Your cards are {player_hand} with a score of {player_sum}.")
    print(f"The dealer's first card is {dealer_hand[0]}.")

    print("\nNow you move first.")
    player_end = False
    while not player_end:
      another_round = input("Type 'y' to deal another card, type 'n' to pass: ").lower()
      if another_round == 'y':
        player_hand.append(choice(cards))
        player_sum = sum(player_hand)

      if player_sum > 21 or another_round == 'n':
        player_end = True
        print(f"Your final hand is {player_hand} with a score of {player_sum}.")
      else:
        print(f"Your hand is now {player_hand} and current score is {player_sum}.")

    if player_sum > 21:
        print("Unfortunately you went over. You lose")
    else:
        print('\nNow dealer moves.')
        dealer_end = False
        while not dealer_end:
            if dealer_sum < 17:
                dealer_hand.append(choice(cards))
                dealer_sum = sum(player_hand)
            else:
                dealer_end = True
        print(f"The dealer's final hand is {dealer_hand} with a score of {dealer_sum}.")

        if player_sum > dealer_sum:
            print("You won!")
        elif player_sum == dealer_sum:
            print("It's a draw")
        else:
            print("You lose.")

    another_game = input("\nDo you like to start a new game? Type 'y' to start and 'n' to exit. ")
    if another_game == 'n':
        new_game = False
    else:
        print("\n")

我尝试过多次运行它，但仍然没有看到它何时停止工作的明确模式。

谁能帮我发现错误？