Transit Cards Disappeared from Wallet App

I use a Clipper Card weekly for public transit, and had created this Clipper Card, and managed the balance, exclusively through the Wallet app on my iPhone. This has worked fine for a number of months, using my phone to tap for payment.

I am planning travel to Japan, and subsequently created and added a balance to a Suica payment card (using my Apple Card) to the Wallet app.

I then proceeded to add both the Clipper Card and Suica Card to my Apple Watch (Watch Series 6), so I could Express Pay for transit using that device as well (both cards were selected to be able to Express Pay).

At some point after doing this, both the Suica Card and my Clipper Card have now completely disappeared from the Wallet app on my iPhone (cannot see the cards, they're not listed as 'Expired', I cannot add them back through the 'Add Card' wallet flow), but both remain accessible on my Watch. I can only access whatever information exists about these cards on the Watch, but am seemingly unable to manage them from the phone, or from any other iCloud device (Macbook, etc.)