DFF Default Value Not Reflecting in Classic Manage Supplier Registration Request Page

We have a business requirement related to Supplier Registration Redwood pages.

A DFF field named “Procurement / Finance Supplier” was configured as a hidden field in the Supplier Registration Redwood page. Under “Configure Fields and Regions,” we configured a default value expression so that:

• If the supplier registration source is INTERNAL_REQUEST, the field value should be “None”
• Otherwise (for external supplier registration), the field value should automatically be populated as “Procurement Supplier”

This functionality was previously working as expected, and the value was correctly reflected in the “Manage Supplier Registration Requests” classic page.

Below is the configured code used in the default value expression: