SAP Wokflow Substitution

[Baba Jammi]

Not sure if this is how workflow substition works or I am missing something. Please advise.
 
User A substitutes for B for period 03/22 thru 03/25.
 
On 03/23 workflow finds agent A as approver for a task and delivers task to agent B as he is substitute. 
 
Agent B, takes NO action on the task.
 
On 03/25, workflow substitution exprires.
 
On 03/26, task still appearing in Agent B's inbox whereas I was expecting it to appear in agent A's inbox as substitution expired. 

Thank you,
Baba
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