Prefix dropdown in checkout doesn't select empty value by default if required

[DanieliMi]

Preconditions (*)

1. Magento 2.2.6
2. Luma Theme

Steps to reproduce (*)

1. In Admin Backend go to Stores > Configuration > Customers > Name and Address Options
2. Set "Show Prefix" to "Required"
3. Set "Prefix Dropdown Options" to ";Mr.;Mrs."
4. Save Config
5. Go to your store
6. Add a item to your cart
7. Go to checkout

Expected result (*)

I expect the empty value in the prefix dropdown to be selected by default.

Actual result (*)

Instead of having the empty value selected by default it will be always the first value selected.

Additional information

[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
• Expected and actual results

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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where $VERSION is version tags (starting from 2.2.0+) or develop branches (for example: 2.3-develop).
For more details, please, review the Magento Contributor Assistant documentation.

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

• yes
• no

[DanieliMi]

@magento-engcom-team give me 2.2.6 instance

[magento-engcom-team]

Hi @DanieliMi. Thank you for your request. I'm working on Magento 2.2.6 instance for you

[magento-engcom-team]

Hi @DanieliMi, here is your Magento instance.
Admin access: http://ec2-34-228-235-121.compute-1.amazonaws.com/i-18823-2-2-6//admin
Login: admin Password: 123123q
Instance will be terminated in up to 3 hours.

[DanieliMi]

Yes i can confirm i was able to reproduce the problem.

[magento-engcom-team]

Hi @hardik-krish. Thank you for working on this issue.
In order to make sure that issue has enough information and ready for development, please read and check the following instruction: 👇

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[hardik-krish]

Yes i am also able to reproduce this issue. Same things working fine in customer registration area.

[magento-engcom-team]

@hardik-krish Thank you for verifying the issue.

Unfortunately, not enough information was provided to created internal ticket. Please consider adding the following:

• Add "Component: " label(s) to this ticket based on verification result. If uncertain, you may follow the best guess
• Add "Reproduced on " label(s) to this ticket based on verification result

Once all required information is added, please add label "Issue: Confirmed" again.
Thanks!

[magento-engcom-team]

Hi @engcom-backlog-nazar. Thank you for working on this issue.
In order to make sure that issue has enough information and ready for development, please read and check the following instruction: 👇

• 1. Verify that issue has all the required information. (Preconditions, Steps to reproduce, Expected result, Actual result).

  Details

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• 2. Verify that issue has a meaningful description and provides enough information to reproduce the issue. If the report is valid, add Issue: Clear Description label to the issue by yourself.

• 3. Add Component: XXXXX label(s) to the ticket, indicating the components it may be related to.

• 4. Verify that the issue is reproducible on 2.3-develop branch

  Details

  - Add the comment @magento-engcom-team give me 2.3-develop instance to deploy test instance on Magento infrastructure.
  - If the issue is reproducible on 2.3-develop branch, please, add the label Reproduced on 2.3.x.
  - If the issue is not reproducible, add your comment that issue is not reproducible and close the issue and stop verification process here!

• 5. Verify that the issue is reproducible on 2.2-develop branch.

  Details

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• 6. Add label Issue: Confirmed once verification is complete.

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