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In this drupal api example: https://api.drupal.org/api/examples/ajax_example%21src%21Form%21DynamicFormSections.php/class/DynamicFormSections/8.x-1.x

Why $form_state->getValue('question_type_select') is by default empty inside the submitForm() function (line 180) so that we need to add a $form_state->setValue('question_type_select', $form_state->getUserInput()['question_type_select']); ?

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