Issue #3219983: How to remove span class="views-field views-field-fieldset". Again.

src/Plugin/views/field/Fieldset.php

@@ -154,9 +154,8 @@ class Fieldset extends FieldPluginBase {
    * {@inheritdoc}
    */
   public function buildOptionsForm(&$form, FormStateInterface $form_state) {
-    $fake_form = [];
-    parent::buildOptionsForm($fake_form, $form_state);
-    $form['admin_label'] = $fake_form['admin_label'];
+    parent::buildOptionsForm($form, $form_state);
+
     $form['fields'] = [
       '#type' => 'value',
       '#value' => $this->options['fields'],