src/PersistentData/PersistentDataManager.php

@@ -278,10 +278,7 @@ class PersistentDataManager implements IPersistentDataManager
                     $method = 'set' . str_replace('_', '', ucwords($relation, '_'));
                     $model->$method($relationModel);
                 } else {
-                    while (substr($key, 0, strlen($relation . '__')) === $relation . '__') {
-                        next($data);
-                        $key = key($data);
-                    }
+                    next($data);
                 }
 
                 next($relations);