Form submission field not available in form action

I have the following form submission handler.

function mymod_form_submit(&$form, FormStateInterface $form_state) {
  $ka_selected = $form_state->getValue('ka_types');
  \Drupal::state()->set('ka_types', $ka_selected);
  return $ka_selected;
}

It returns the ka_types field value. I want to use $ka_selected in custom action code.

public function execute(ContentEntityInterface $entity = NULL) {
    //Read all the fields from entity
    $comment = $entity->get('comment_body')->getValue();
    $file_uri = file_create_url($entity->field_attachment->entity->getFileUri());
    $file_name = $entity->field_attachment->entity->getFileName();
    $ka = $entity->ka_selected->entity->getValue(); **//error thrown here**
    dd($ka);
}

I am able to read other view entities but not just this field.

How can I use the value of $ka_selected in my custom action?

Alright, I am able to figure out the answer from the below link: https://www.drupal.org/forum/support/module-development-and-code-questions/2021-07-04/read-view-row-entities-and-create-a#comment-14154305

public function execute(ContentEntityInterface $entity = NULL) {
    //Read all the fields from entity
    $comment = $entity->get('comment_body')->getValue();
    $file_uri = file_create_url($entity->field_attachment->entity->getFileUri());
    $file_name = $entity->field_attachment->entity->getFileName();
    $ka = \Drupal::state()->get('ka_types');
    dd($ka);
}