Errors prevent adding phone number or address to contact

Problem/Motivation

Can't add phone number or address to contact. (email addresses are fine)

Steps to reproduce

1. Install CRM
2. Navigate to a contact entity add form (e.g. `/crm/contact/add/person`) or edit form (e.g. `/crm/contact/3/edit`)
3. Click "Add new telephone" (or "Add new address")
4. Enter a phone number and click "Create telephone" (or "Create address")

Expected:
Telephone number (or address) created

Actual:
Resulting AJAX request errors and telephone number (or address) is not created:

Error: Object of class Drupal\telephone\Plugin\Field\FieldType\TelephoneItem could not be converted to string in Drupal\crm\Entity\ContactDetail\TelephoneContactDetail->label() (line 21 of /var/www/html/src/Entity/ContactDetail/TelephoneContactDetail.php).

TypeError: strlen(): Argument #1 ($string) must be of type string, Drupal\telephone\Plugin\Field\FieldType\TelephoneItem given in strlen() (line 397 of /var/www/html/web/core/lib/Drupal/Component/Utility/Unicode.php)

TypeError: strlen(): Argument #1 ($string) must be of type string, Drupal\address\Plugin\Field\FieldType\AddressItem given in strlen() (line 397 of /var/www/html/web/core/lib/Drupal/Component/Utility/Unicode.php)

Proposed resolution

Remaining tasks