hi,team:

    my dag is 1 minute schedule,one parts dag state is success,but tasks state is not yet started in a dag:

![image](https://user-images.githubusercontent.com/41068725/116344664-357d8780-a819-11eb-8010-c746ffdfdbcc.png)


   how can to fix it?
airflow/settings.py
"""
    Any additional configuration (register callback) for airflow.utils.action_loggers
    module
    :rtype: None
    """
def prepare_syspath():
    """Ensures that certain subfolders of AIRFLOW_HOME are on the classpath"""
    if DAGS_FOLDER not in sys.path:
        sys.path.append(DAGS_FOLDER)
    # Add ./config/ for loading custom log parsers etc, or
    # airflow_local_settings etc.
    config_path = os.path.join(AIRFLOW_HOME, 'config')
    if config_path not in sys.path:
        sys.path.append(config_path)
    if PLUGINS_FOLDER not in sys.path:
        sys.path.append(PLUGINS_FOLDER)
def get_session_lifetime_config():