Create any number of paragraph fields in a multiple value field on node create form
Instead of adding the multi value field items after the form is built you can try to do this on the entity before the form is built:

/**
 * Implements hook_ENTITY_TYPE_create() for 'node'.
 */
function mymodule_node_create(\Drupal\node\NodeInterface $node) {

  if ($node-&gt;getType() == 'my_content_type') {
    // get taxonomy terms
    $query = \Drupal::entityQuery('taxonomy_term');
    $query-&gt;condition('vid', "my_voc");
    $tids = $query-&gt;execute();
    $terms = \Drupal\taxonomy\Entity\Term::loadMultiple($tids);

    $count = count($terms);

    $i = '1';
    foreach ($terms as $term) {
      $paragraph = \Drupal::entityTypeManager()-&gt;getStorage('paragraph')-&gt;create([
        'title' =&gt; 'Paragraph ' . $i,
        'type' =&gt; 'my_paragraph_type',
         // more field data
      ]);
      $node-&gt;field_features_para[] = $paragraph;
      $i++;
    }
  }

}