Custom Payment Method doesn't uncheck 'My billing and shipping address are the same'

[eduard13]

In Magento 2.2.2, 2.2.3 there is no way to get the Magento behavior on My billing and shipping address are the same checkbox when a new custom Offline Payment Method is used.

Preconditions

1. Magento 2.2.3 EE (on Magento 2.2.2 CE as well)
2. PHP 7.1

Steps to reproduce

1. Create an offline payment method
2. Add a product to cart
3. Go to Checkout
4. Fill in the shipping address
5. Go to Payment Step
6. We have our new payment method, and one more - Checkmo
7. Select Checkmo
8. Under Selected Payment Method - My billing and shipping address are the same is checked and below we have the billing address = shipping address
   
9. Go back to shipping step and change some fields
10. Come back on the Payment Step

Expected result

1. My billing and shipping address are the same it should be unchecked
   

Actual result

1. My billing and shipping address are the same is checked, but the address information below doesn't reflect the last changes.
   

Also noticed that if the Custom Payment Method is marked as Unavailable, then everything works as needed

Thanks.

HI @eduard13 thank you for your report.
We've acknowledged the issue and added to our backlog.

[eduard13]

I'm going to work on it.

[magento-engcom-team]

Hi @eduard13. Thank you for your report.
The issue has been fixed in #17593 by @eduard13 in 2.2-develop branch
Related commit(s):

• 8739f8ef2ebedbf0b1e7c61cb607864f81507556

The fix will be available with the upcoming 2.2.7 release.