Using the criteria API the problem can also be reproduced as shown in the follogin listing:

        String entityName = "_testCatalog_Task";
        DetachedCriteria detachedCriteria = DetachedCriteria.forEntityName(entityName);
        detachedCriteria.setFetchMode("subtasks", FetchMode.JOIN);
        detachedCriteria.setFetchMode("subtasks.activities", FetchMode.JOIN);
        List<Map<String, Object>> result = detachedCriteria.getExecutableCriteria(session).list();

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