Hello,
Don't worry, I do not have any kind of issue with English.
But if you want to insult me, go ahead.
How this question can not be understandable??
It's simple, you explain nothing so the problem is not about the question, it's about to fact to follow you and what you're trying to say.
And I'm sorry to tell you that but your description is all wrong.
Shipping address and Billing address. Changing billing address, creating new billing address will also update shipping address.
First part do not have any kind of meaning.
Second part is not possible since you can't change the billing address if you do not have multiple address. So it's not possible to follow you since that point.
Third part is wrong since I was able to create a new billing address in our demo website ; without any kind of issue. And if there was really an issue with the new checkout system regarding that point ; it would been reported for months.
Step 1 :
pasteboard.co/GS7WeRi.png
Step 2 :
pasteboard.co/GS7Wrxk.png
Once again : Working perfectly fine !