Interestingly, enough, I am in the same situation you are I previously had the Yosemite design and then I switched over to the Monet design, from previous experience whenever you request new design, the design also changes on Apple wallet after sometime, however, this time I only got the regular blue design. I called to see if maybe Discover could help, but I could not find any solution. I also tried deleting the card and then deleting it from my previously added cards and I still had no solution. And lastly, I tried to add the card from Safari where you’re able to manage your Discover cards on the account. I wonder if it’s the design itself, I’ll try calling Apple to see if maybe it’s an apple issue, I even have a feeling that it may just be the specific design that’s causing this. Could you please let me know if you found an answer