title: Magento 2.3.3 Customer shipping address firstname trouble. "firstname" is required
body: <p><strong>Summary</strong></p>
  <p>When I try to place an order after the customer registration/Login. Magento 2.3.3 shows &quot;First Name is a required Field Error. Firstname field is not displayed. When I try create shipping address at profile page or at backend - firstname field is displayed but same validation error occured!</p>
  <p>Data was migrated from 1.9.3.4 by Data migration tool</p>
  <p>I read about same troubles in another versions magento but no solutions found</p>
  <p>I try to play with eav_attribute and customer_eav_attribute. I put is_visible=1 and is_required=0 but It not helps</p>
  <p><strong>Steps to reproduce</strong></p>
  <ol>
  <li>Login</li>
  <li>Checkout order</li>
  <li>Fill shipping form</li>
  <li>Error displayed: Please check the shipping address information. &quot;firstname&quot; is required. Enter and try again.</li>
  </ol>
  <p><strong>Screenshots</strong></p>
  <p><img src="https://i.stack.imgur.com/wjIb0.png" alt="Place order - firstname is hidden" /></p>
  <p><img src="https://i.stack.imgur.com/iJqSU.png" alt="Profile create shipping address" /></p>
  <p><img src="https://i.stack.imgur.com/rK9aw.png" alt="Backend = customer edit - shipping address add" /></p>