Credit card autofill is GREAT except for 3-digit security code

Thanks for the reply, @TimInBC, strange behaviour indeed. I agree that a note field wouldn't be the culprit here.

Could I confirm that the autofill is coming from 1Password and not, for example, your browser's built-in password manager? We recommend turning those off to avoid any conflict with 1Password: Turn off the built-in password manager in your browser

If the issue persists, I'd like to ask you to create a new credit card item with the same information and let me know if you see the same behaviour. Is it happening across multiple websites? Any other information that you can share might help us get to the bottom of this. Thanks!