Pei-Cheng-Yu commented on issue #58335:
URL: https://github.com/apache/airflow/issues/58335#issuecomment-3548455180

   I just find out that the DurationChart renders a “run duration” bar only 
when entry.end_date is present.
   For Task Instance entries, end_date is null while the task is still running.
   As a result, the Task Instance overview chart does not show a running bar, 
and it only renders after the task finishes.
   
   debug loging:
   <img width="1214" height="122" alt="Image" 
src="https://github.com/user-attachments/assets/224811ca-babd-4d12-8777-d1dad1130d20";
 />
   
   
   I have open a PR to replace the null data


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