FOB Point on Drop Ship Purchase Order not carrying over to Sales Order

In 23R2, when you create a drop ship purchase order and select a value in the FOB Point field, then create a Sales Order from the Purchase Order, the FOB Point value is not being transferred to the Sales Order.

Is this expected behavior or is this a bug?

As a workaround, I’m trying to add an event handler to the CreateSalesOrder action.  However, I believe this action is actually in the public class DropShipLinksExt : PXGraphExtension<POOrderEntry> extension.

    public class POOrderEntry_Extension : PXGraphExtension<POOrderEntry>
    {
        public static bool IsActive() => true;

        [PXOverride]
        public IEnumerable createSalesOrder(PXAdapter adapter, Func<PXAdapter, IEnumerable> baseMethod)
        {
            PXGraph.InstanceCreated.AddHandler(delegate (SOOrderEntry graph)
            {
                graph.RowUpdated.AddHandler<SOOrder>(delegate (PXCache sender, PXRowUpdatedEventArgs e)
                {
                    SOOrder objSOOrder = e.Row as SOOrder;
                    if (objSOOrder != null)
                    {
                        sender.SetValueExt<SOOrder.fOBPoint>((object)objSOOrder, Base.Document.Current.FOBPoint);
                    }
                });
            });
            return baseMethod(adapter);
        }
}

In my override, I have an error:

Should I be overriding the DropShipLinksExt?  If so, how?  I’ve tried doing this but it creates an error as well:

If you think that this topic is due to a bug, let me know what you think.  I may need to submit a ticket with support.  I don’t want to submit a support ticket if this is an expected behavior.