Undefined array key "organization", "first_name", "last_name" , etc

Problem/Motivation

I see multiple warnings on the settings page at."admin/config/system/taxonomy-place/settings" just after enabling the module, such as (in long format):

Warning: Undefined array key "organization" in Drupal\taxonomy_place\Form\SettingsForm->buildForm() (line 143 of modules/contrib/taxonomy_place/src/Form/SettingsForm.php). 

Warning: Undefined array key "first_name" in Drupal\taxonomy_place\Form\SettingsForm->buildForm() (line 148 of modules/contrib/taxonomy_place/src/Form/SettingsForm.php). 

Warning: Undefined array key "last_name" in Drupal\taxonomy_place\Form\SettingsForm->buildForm() (line 153 of modules/contrib/taxonomy_place/src/Form/SettingsForm.php). 

Steps to reproduce

I am at Drupal 9.5.11 and have an existing taxonomy with an address field. I enabled the modules and visited the settings page to configure them and got these warnings.

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes