edwardwang888 commented on issue #16824:
URL: https://github.com/apache/airflow/issues/16824#issuecomment-875241895


   A few more observations:
   - I think the missing borders are due to the run being a manual run - the 
borderless white box is meant to display when the task instance previously 
existed but has been cleared. (In this case, the non-existent task instances 
are incorrectly added to the DB to make them appear as if they previously 
existed.)
   - Non-existent tasks and tasks with `null` state actually are actually not 
equivalent - the way the scheduler treats them seems to depend on whether the 
DAG run is manual/scheduled.
   - The bug above disappears once there is at least one schedule DAG run.
   
   I think it may be better to separate the backend DB bugs to another issue.
   
   In terms of the UI, I guess the main consideration is whether to add a 
border when the run is manual but the box color is white?


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