Affected version:
All - if CC specific prefs are enabled

Tested on:
Windows 10
MacOS 10.13
Ubuntu 16.04

Steps to reproduce:

1. Reach the payment form on apple.com
2. Check the dropdown for the Exp. date and select the saved entry

Expected results:

1. Expiration date should be correctly displayed in the dropdown and autofilled in the field.

Actual results:

1. Only the expiration year is correctly displayed and autofilled. The month is cut off and not autofilled. (in the recording you can see it will split 2026 to 20/26 instead of taking 08 from the saved CC card info)

Notes:
Exp Date field:
<input aria-required="true" aria-labelledby="checkout.billing.billingOptions.selectedBillingOptions.creditCard.cardInputs.cardInput-0.expiration-label " aria-describedby="checkout.billing.billingOptions.selectedBillingOptions.creditCard.cardInputs.cardInput-0.expiration-error" aria-invalid="true" data-autom="expiration-input" value="" data-recon-click="binding,actionClick,checkout.billing.billingOptions.selectedBillingOptions.creditCard.cardInputs.cardInput-0.expiration,binding" data-recon-mouseover="binding,actionMouseOver,checkout.billing.billingOptions.selectedBillingOptions.creditCard.cardInputs.cardInput-0.expiration,binding" data-recon-mouseout="binding,actionMouseOut,checkout.billing.billingOptions.selectedBillingOptions.creditCard.cardInputs.cardInput-0.expiration,binding" data-recon-input="binding,setValue,checkout.billing.billingOptions.selectedBillingOptions.creditCard.cardInputs.cardInput-0.expiration,binding" data-recon-change="binding,setValue,checkout.billing.billingOptions.selectedBillingOptions.creditCard.cardInputs.cardInput-0.expiration,binding" data-recon-focusin="binding,setFocus,checkout.billing.billingOptions.selectedBillingOptions.creditCard.cardInputs.cardInput-0.expiration,binding" data-recon-focusout="binding,clearFocus,checkout.billing.billingOptions.selectedBillingOptions.creditCard.cardInputs.cardInput-0.expiration,binding" type="tel" id="checkout.billing.billingOptions.selectedBillingOptions.creditCard.cardInputs.cardInput-0.expiration" name="expiration" class="form-textbox-input" required="" maxlength="5">

Found Bug 1452605 which looks similar to this, but I am not sure if its the same root cause. This can be duplicated if it is.

Updating whiteboard tag for team triage.

Can you attach the recording?

This is another issue with truncation of expiration date. The proof of concept patch on Bug 1645735 (Staples) fixes the Apple site as well. As any fix for one site will fix the other, I'm duping this bug to that one.

Sorry, forgot to attach the recording last time. This issue should be already handled by Bug 1645735 but unfortunately I am hitting into Bug 1653915 right now. Please check that issue for more info.

FYI: Autofill now works correctly on the latest Nightly 81.0a1 (2020-08-12) (64-bit) and this issue of the expiration date is also no longer reproducible.