Primary Point of Contact changed, but SR is still visible to original primary point of contact

Summary:

We have a scenario where an Agent creates an SR using Person A as the primary point of contact. Person A can see the SR under 'My Help'.

The Agent realizes that they have made a mistake, and changes the primary point of contact to 'Person B' - Person B can now see the SR under 'My Help', however Person A still has access to this SR. As we are using HRHD for grievances and disciplinaries, we cannot allow Person A to view/access this SR.

I have seen numerous posts similar to this issue, but wanted to confirm if this is standard functionality, or is there a way to remove access from Person A.