Donor 922456 reported that the form was blocking them from seeing the numbers they were entering. We asked for details, and they provided a screenshot. It shows that the message "La tua carta di credito/debito verra elaborata in modo sicuro" (trans: your card will be processed securely) does block the top half of the card number field. They entered 12 digits and then reached out to us.

I created smaller screenshots around the number field to not show that in Phab, because you can kind of tell what their #s are from the bottom halves in their screenshot.

This is the only case we've seen so far. We will thank them for their feedback and ask for browser and device specs, but I wanted to document this now in case we see more.