Next Gen Supplier - Why is procurement agent setup required for internal registration now?

We recently went live with Next Gen Supplier in our PROD environment. Since we implemented Next Gen Supplier, our users that submit internal requisitions cannot put a Procurement BU in the company details section without having Procurement Agent setup "Manage Suppliers". We didn't need this setup for internal registrations before. Is this a new security requirement/ expected functionality for Next Gen Supplier? I tried putting in an SR but was directed here.

We also use custom roles that contain seeded privileges. That being said, out ADMIN account still couldn't access the Procurement BU dropdown without the procurement agent setup.