First take

Closes #3441006

core/lib/Drupal/Core/Form/FormBuilder.php

@@ -834,7 +834,9 @@ public function prepareForm($form_id, &$form, FormStateInterface &$form_state) {
     if (isset($build_info['base_form_id'])) {
       $hooks[] = 'form_' . $build_info['base_form_id'];
     }
-    $hooks[] = 'form_' . $form_id;
+    if (empty($form['#skip_alter_form_id'])) {
+      $hooks[] = 'form_' . $form_id;
+    }
     $this->moduleHandler->alter($hooks, $form, $form_state, $form_id);
     $this->themeManager->alter($hooks, $form, $form_state, $form_id);
   }