Shipping address is not validated in checkout when proceeding step as logged in user with default shipping address

[DanieliMi]

Summary

The shipping address is not beeing validated (correctly?) for logged in users with addresses. If you already have customers in your shop and make changes to your address settings for your store this can lead to bad usability experience for your customers because they need to leave the checkout make change sin address book and then go back to checkout.

Preconditions (*)

1. v.2.2.6

Steps to reproduce (*)

1. Create a User
2. Go to My Account > Address Book
3. Add an default address (without a state)
4. In Admin Backend go to Stores > Configuration > General > State Options
5. Required State for a Country of your choice (I tested with Germany and United States)
6. With your created user put a product in your cart and proceed to checkout
7. Your created default address should be selected by default as shipping address
8. Proceed to step 2
9. Place Order

Expected result (*)

I expected to be stopped when trying to get to step 2 (Review & Payments) due to missing region in shipping address. I expected to get prompted to add the missing region.

Actual result (*)

It is possible to reach step 2 and press the Place Order button. Then I get the error message of the missing regionId.

[magento-engcom-team]

Hi @DanieliMi. Thank you for your report.
To help us process this issue please make sure that you provided the following information:

• Summary of the issue
• Information on your environment
• Steps to reproduce
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Please make sure that the issue is reproducible on the vanilla Magento instance following Steps to reproduce. To deploy vanilla Magento instance on our environment, please, add a comment to the issue:

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@DanieliMi do you confirm that you was able to reproduce the issue on vanilla Magento instance following steps to reproduce?

• yes
• no

[DanieliMi]

I confirm i can reproduce the issue on vanilla Magento 2.2.6

[magento-engcom-team]

Hi @engcom-backlog-nazar. Thank you for working on this issue.
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[magento-engcom-team]

@engcom-backlog-nazar Thank you for verifying the issue. Based on the provided information internal tickets MAGETWO-96059, MAGETWO-96060 were created

[magento-engcom-team]

Hi @StasKozar. Thank you for working on this issue.
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