Hey Ina, I wasn't able to reproduce this issue today. For me for both of the forms, the initial one and the one you reach through the back button, seem to work as expected. Also for the expiry date there is no issue for me, the autofill and preview works, and the popup is displayed. Can you maybe try to reproduce the expiry field issue again, to see if it's still a problem?
Bug 1822599 Comment 6 Edit History
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Hey Ina, I wasn't able to reproduce this issue today. For me for both of the forms, the initial one and the one you reach through the back button, seem to work as expected. Also for the expiry date there is no issue for me, the autofill and preview works, and the dropdown is displayed. Can you maybe try to reproduce the expiry field issue again, to see if it's still a problem?