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
app = application.cached_app(testing=True)
        app.url_map.add(Rule("/debug", endpoint="debug"))
        def debug_view():
            from flask import request
            
            assert request.remote_addr == '192.168.0.2'
            
            
            assert request.url == 'http://invalid:9000/internal-client/debug'
            return Response("success")
        app.view_functions['debug'] = debug_view