Card deck removed after syncing but can't be imported (already there)

After syncing, one card deck is missing. When I search in the card browser, I can find the cards (not in a deck but in the card types). It shows that the cards are in the deck they were before but the deck is not shown in the card browser and not in the deck overview. When I try to import the deck, Anki says that all the cards are already there. Is there anything I can do to get the deck back? The deck contains around 1000 cards.

I suspect you’ve renamed the ‘default’ deck, which is hidden when no cards in it are due. If you select the cards in the browse screen, you can change them to a different deck with a name of your choosing