When playing in manual mode with custom cards, custom cards become invalid cards when they return to the deck or are revealed when the hand is shuffled

  1. Bug description
    Custom cards that are returned from the field, GY, or banishment to the deck become invalid cards (show only card backs or @Ignister token) when drawn again. Double clicking the deck will still show the cards on the top of the deck. Attempting to move the card from the deck to the field from that menu will move the next card in the deck instead. The game became unresponsive once when I did this, but I have not been able to reproduce this behavior.
    Custom cards that are revealed in the hand become invalid cards when the hand is shuffled.
    Custom cards that are revealed in the hand and are then put on the field become invalid cards when returned to the hand. This one seems to be less consistent than the other issues.
    Custom cards that are played from the hand, returned to the hand, played to the field again, and then returned to the hand again will become invalid cards.
    Custom cards summoned from the Extra Deck, returned to the Extra Deck, and then summoned again become invalid cards if removed from the field again.
    This all happens in online games, even against bots, but not in local games.

  2. Bug reproduction steps

    1. Begin online game in manual mode using custom cards.
    2. Place a custom card on the field.
    3. Move the custom card to the top of the deck.
    4. Draw the custom card. It will be an invalid card instead of the card it was before.
    5. Reveal a custom card in your hand.
    6. Shuffle your hand. The revealed card will now be an invalid card.
    7. Play a custom card from your hand to the field.
    8. Return the custom card to the hand.
    9. Play the custom card to the field again.
    10. Return in to the hand again. It is now an invalid card.
    11. Move a custom card from the extra deck to the field.
    12. Return the custom card to the extra deck.
    13. Move it to the field again.
    14. Move it to the Extra Deck, GY, or hand. It is now an invalid card.

In the following replay, all the cards are custom cards, which I assume will mean you may be unable to see them. Know that all the cards played at the end became invalid as outlined above. The Extra Deck monster appeared invalid when sent to the GY when playing, but it showed up correctly in the replay. None of the other cards appeared correct in the replay.

Spoiler

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  1. Screenshot OR error code
    The “face down” cards in this image are all invalid cards.

  2. Expected behavior
    The custom cards should continue to exist as they are when returned to the deck, shuffled in hand, etc.

  3. What OS are you using
    Windows-10

One more detail: The game also slows down noticeably over several minutes while invalid cards are around.