Why data access set is not working as expected?

Summary:

One user can access another business unit than one business unit granted to her in data access set.

Content (please ensure you mask any confidential information):

One user is granted Accounts Payable Invoice Supervisor and Cash Manager seeded roles.

Data access set is granted to access one business unit.

But the user can see another one business unit invoice.

In the environment, we have 4 business units available in data access set assignment.

When Cash Manager role is removed, the user can see only invoices of that business unit granted to her in data access set assignemnt.

SR 3-38372035241 : CCC Data Access set is not working as expected raised and get referred to CCC.