Non-negotiated BPA Lines not returning rejected PO lines as they should

Summary:

We mark some BPA line as non-negotiated so that after approval, the purchase order will be created but in a status of "Rejected." This allows us to cancel the rejected PO to return it to Process Requisitions to make any required changes or add it to an existing PO. Since 25A (we believe), the purchase order lines are being automatically created and sent to the suppliers with a status of "Open." Can you please advise what has changed and how to revert back to these POs being rejected?

Version (include the version you are using, if applicable):

All environments - Prod and Non-prod