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?
tests/www/test_app.py
@classmethod
    def setUpClass(cls) -> None:
        from airflow import settings
        settings.configure_orm()
    @conf_vars(
        {
            ('webserver', 'enable_proxy_fix'): 'True',
            ('webserver', 'proxy_fix_x_for'): '1',
            ('webserver', 'proxy_fix_x_proto'): '1',
            ('webserver', 'proxy_fix_x_host'): '1',
            ('webserver', 'proxy_fix_x_port'): '1',
            ('webserver', 'proxy_fix_x_prefix'): '1',
        }
    )
    @dont_initialize_flask_app_submodules
    def test_should_respect_proxy_fix(self):
        app = application.cached_app(testing=True)
        app.url_map.add(Rule("/debug", endpoint="debug"))
        def debug_view():