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web/modules/custom/materio_sapi/materio_sapi.module

@@ -8,6 +8,8 @@
 use Drupal\Core\Routing\RouteMatchInterface;
 use Solarium\QueryType\Select\Query\Query;
 use Drupal\search_api\Query\QueryInterface;
+use Drupal\Core\Template\Attribute;
+
 /**
  * Implements hook_help().
  */
@@ -48,3 +50,20 @@ function materio_sapi_search_api_solr_query_alter(Query $solarium_query,  QueryI
   }
 
 }
+
+/**
+ * Prepares variables for fieldset element templates.
+ *
+ * Default template: fieldset.html.twig.
+ *
+ * @param array $variables
+ *   An associative array containing:
+ *   - element: An associative array containing the properties of the element.
+ *     Properties used: #attributes, #children, #description, #id, #title,
+ *     #value.
+ */
+function materio_sapi_preprocess_fieldset(&$variables) {
+  if (isset($variables['element']['#legend_attributes'])) {
+    $variables['legend']['attributes'] = new Attribute($variables['element']['#legend_attributes']);
+  }
+}