Payment fields disappear after changing country while another payment method is selected

[billrobbins]

Describe the bug

~When the WP Google Maps plugin is active and WooCommerce Payments has payment methods in addition to credit cards, this can cause the payment fields to disappear.~ If another payment method is selected while the billing address gets changed, this causes UPE fields to no longer appear.

To Reproduce

1. In WooCommerce Payment Settings, enable the "early access" for additional payment methods, ~like Sofort and giropay~ you don't even need to enable any of those methods.
2. Make sure at least one additional (non-WCPay) payment gateway is active.
3. Add an item to the cart and go to checkout.
4. Enter a billing address and notice how the payment methods are available.
5. ~Select "sofort" as the payment method.~
6. Select the non-WooCommerce Payments gateway.
7. Change the country on the billing address.
8. Click on WooCommerce Payments.

Actual behavior

Following the steps above, the user will not be able to interact with the payment fields with WooCommerce Payments. They won't load unless the page is refreshed.

Screenshots

Expected behavior

I expect that changing the billing address won't affect the loading of the payment methods.

Desktop (please complete the following information):

• OS: MacOS 11.5.2
• Browser: Chrome
• Version: 93.0.4577.82 (Official Build) (x86_64)

Additional context

4288818-zen

[RadoslavGeorgiev]

I tried to replicate this behavior and found out that this issue is not specific to either:

• Additional WCPay payment methods (SEPA, Sofort, etc.). As long as UPE/early access is enabled, the bug will appear.
• No need to install WP Google Maps. This is not a compatibility issue, but an issue with WCPay itself.

I've updated the description and title of the issue.

[RadoslavGeorgiev]

After none of us managed to reproduce the issue in p1639658360195600-slack-C01BPL3ALGP, it turned out to have been fixed here: https://github.com/Automattic/woocommerce-payments/pull/3331