Adding compatibility with the Sequential Order Numbers plugin

We are using both the CartFlows and Sequential Order Numbers Pro plugins on our store. While the sequential order numbering works correctly for regular purchases made through CartFlows, we’ve noticed an issue when an upsell product is selected—its order number does not follow the expected sequence and appears to be assigned randomly. We reached out to CartFlows support, and they recommended that we contact your team for assistance in resolving this issue. Could you please help us identify the cause and provide a solution? Looking forward to your guidance and support.