The card Number and Expiration date fields are now fixed and working as expected when the autofill is triggered from the card Number or expiration date fields. The card Name field is still working separately and it seems to be in the same iframe with the card Number and expiration date fields. See the about:autofill attached here. Screen recording in comment 3.
Bug 1897461 Comment 2 Edit History
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The card Number and Expiration date fields are now fixed and working as expected when the autofill is triggered from the card Number or expiration date fields. The card Name field is still working separately and it seems to be in an iframe having the same origin with the card Number and expiration date fields. See the about:autofill attached here. Screen recording in comment 3.