Changing requester's name does not result in the site updating to correspond to the new requester.

Changing requester's name does not result in the site updating to correspond to the new requester.

There are occasions when we need to change the requesters name on a ticket, however when the name is changed the 'site' field does not automatically update the site correspondingly to the new users associated site.
 
Is this a bug or is there a workaround?
 
Many Thanks. 

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