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
#
#
#
import runpy
import sys
import unittest
from datetime import timedelta
from unittest import mock
import pytest
from werkzeug.routing import Rule
from werkzeug.test import create_environ
from werkzeug.wrappers import Response
from airflow.www import app as application
from tests.test_utils.config import conf_vars
from tests.test_utils.decorators import dont_initialize_flask_app_submodules
class TestApp(unittest.TestCase):