3810087 - Supplier custom field values empty after registration despite being present in Vendor Master

I have a supplier that has completed registration but custom fields that should have been populated from the Vendor Master record are showing as empty on the Supplier record. The values are present on the Vendor Master. No errors were reported during the upload or registration.

onboarding, blank, missing , KBA , BNS-FG-SUP-VM , Supplier - Vendor Master , BNS-FG-SUP-SM , Supplier - Supplier Maintenance , BNS-FG-CON-CF , Configuration - Custom Field , BNS-FG-SUP-SI , Supplier - Supplier Invitation , Problem