The execution duration of a workflow becomes longer and longer after the workflow runs for a period of time.

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The same shell workflow is executed within one second when it is created. After the workflow runs for a period of time, the interval between start_time and end_time in the process_instance table of the workflow becomes longer and longer. However, the log of the worker node shows that the start time of log printing is very late, which is close to the time specified by end_time. Why is the worker node not executed immediately after start_time delivers a task?