This bug has been fixed after the recent update.
1. Bug description
I can not start a duel when the card “Yubel” is in my deck in DL mode. 2. Bug reproduction steps A.join a Yubel card into deck
B.start a DL duel.
C.I can not start. 3. Screenshot OR error code 4. Expected behavior
I think it should be able to join into the deck.