Order form is dropping second last names unexpectedly

[backwardstruck]

Describe the Bug
When creating a user that has more than one last name, which is common in many countries, and that user is loaded onto a new order, only one of the last names is pulled. If you edit the user, only the last name was saved. The question is whether this is by design or a bug.

For additional information, reference this ticket: https://a8c.zendesk.com/agent/tickets/7895292 and Slack discussion. It's not clear why this issue has not been encountered before, suggesting it may not have been reported by customers.

To Reproduce
Steps to reproduce the behavior:

1. Create a user with more than one last name.
2. Load that user onto a new order.
3. Only one of the last names appears.
4. Edit the user.
5. Only the last name was saved.

Screenshots

Expected behavior
When creating users with more than one last name and loading those users onto new orders, or editing them, all last names should accurately be saved and displayed.

Isolating the problem (mark completed items with an [x]):

• This bug occurs with the latest version of WooCommerce Android.
• This bug happens consistently using the steps above.

[dangermattic]

Thanks for reporting! 👍

[wpmobilebot]

Version 21.2 has now entered code-freeze, so the milestone of this PR has been updated to 21.3.