Account Code API not always returning the Class column

ZBR Connector

After the June 26 critical maintenance 65846, the API endpoint for Account Codes stopped returning the Class column for some customers but not all, even if the column had values in some account codes. We cannot determine any pattern to this. How can you resolve this so the API always returns the class column when requested? We've been using this API request for years without incident until June 26 2025.