Incompatibility with Drupal 10.2 field UI changes

Problem/Motivation

The Allow Only One module can be added, but when changing configuration options for the field type during setup, it presents an Ajax error.

In my case, the error is:

ResponseText: The website encountered an unexpected error. Try again later.UnexpectedValueException: The subform is not contained by the given parent form. in Drupal\Core\Form\SubformState->getParents() (line 92 of core/lib/Drupal/Core/Form/SubformState.php). Drupal\Core\Form\SubformState->getValues() (Line: 26)

The error's message makes me think directly to an incompatibilty with the 10.2 changes around forms and subforms in:
https://www.drupal.org/node/3386675
https://www.drupal.org/node/3391654
https://www.drupal.org/node/3347291

Other modules had this same type of issue, according to issues like:
https://www.drupal.org/project/metatag/issues/3419378
https://www.drupal.org/project/readonly_html_field/issues/3426382
https://www.drupal.org/project/custom_field/issues/3400256
https://www.drupal.org/project/datafield/issues/3409324

Steps to reproduce

- Install the Allow Only One module
- On the "Manage fields" of any entity bundle, add a field as follow.
- Add a field label
- Choose "Allow Only One" as the field type
- Click "Continue" button
- Under "Allowed number of values", change the setting and witness and Ajax error

Proposed resolution

- Make the Allow Only One module compatible with the Drupal core 10.2 field UI changes