Issue #3445730 by erik_petra: After creating a menu, menu transform block does not show up

transform_api.module

@@ -97,3 +97,27 @@ function transform_api_entity_base_field_info_alter(&$fields, EntityTypeInterfac
     }
   }
 }
+
+/**
+ * Implements hook_ENTITY_TYPE_insert().
+ */
+function transform_api_menu_insert(EntityInterface $entity) {
+  // Invalidate the transform block cache to update menu-based derivatives.
+  \Drupal::service('plugin.manager.transform_api.transform_block')->clearCachedDefinitions();
+}
+
+/**
+ * Implements hook_ENTITY_TYPE_update().
+ */
+function transform_api_menu_update(EntityInterface $entity) {
+  // Invalidate the transform block cache to update menu-based derivatives.
+  \Drupal::service('plugin.manager.transform_api.transform_block')->clearCachedDefinitions();
+}
+
+/**
+ * Implements hook_ENTITY_TYPE_delete().
+ */
+function transform_api_menu_delete(EntityInterface $entity) {
+  // Invalidate the transform block cache to update menu-based derivatives.
+  \Drupal::service('plugin.manager.transform_api.transform_block')->clearCachedDefinitions();
+}