Zend certified PHP/Magento developer

Magento 2.3.4 – Name prefix no selection in admin panel

We enabled the prefix option in the customer configuration and made it required.

When creating a customer in the admin panel, we do not get a selection box for the prefix, but a input field. But we do entered some values that should be selected.

So how can we solve this issue and change this into a selection field with the options?

enter image description here