Queue is not automatically updating upon changing Primary Point of Contact in Classic Helpdesk

Issue: Queue is not automatically updating upon changing Primary Point of Contact in Classic Helpdesk

Steps to Replicate:

1. Login to system
2. Go to Help Desk > HR Service Requests
3. View existing SR Details (with Queue: Europe and Africa Queue)
4. Update the Primary Point of Contact (using person with Business Unit under Queue: Asia Queue)
5. Click Save button

Actual result: The displayed Queue (e.g Europe and Africa Queue) remain the same even after I updated the Primary Point of Contact.

Expected: The displayed Queue will automatically update (e.g Asia Queue) based on the Business Unit of the updated Primary Point of Contact