Adobe Commerce 2.3.5, 2.3.5-p1 patch: country payment issue

This patch resolves an issue in Adobe Commerce where the storefront checkout workflow did not display any payment method that has been enabled for specific countries, except for Klarna and Amazon Pay.

Affected products and versions

Adobe Commerce on cloud infrastructure 2.3.5 and 2.3.5-p1
Adobe Commerce on-premises 2.3.5 and 2.3.5-p1

Issue

When a store has Amazon Pay and another payment assigned to different countries, and when one of those countries and payment methods is selected, the payment method and place order buttons are not visible.

A web page refresh is a workaround for the issue.

To resolve this issue and remove the error, we have created a patch.

Prerequisites:

A simple product is created.
Check/Money order is enabled only for specific countries (at Store > Configuration > Sales > Payment Methods).
Example: Payment from Applicable Countries = Specific Countries
Example: Payment from Specific Countries = United Kingdom

Steps to reproduce:

Go to the Storefront as a Guest.
Add a simple product to the shopping cart.
Go to Checkout.
Fill the form with valid data.
- Country = United States
Select shipping rate and click Next.
- Payment step is opened.
- There are no available payments.
- Message: No Payment method available.
- There is no Place Order button.
Go back to the Shipping Step and change the value to:
- Country = United Kingdom
Select shipping rate and click Next.