I just enabled the serializable carts mode for our recently upgraded commerce 13.30 solution (upgraded from commerce 11). However, I am getting the error "System.InvalidCastException: 'Unable to cast object of type 'EPiServer.Commerce.Order.Internal.SerializableCart' to type 'Mediachase.Commerce.Orders.OrderGroup'.'" right before we attept to run the workflow. This makes sense but I'm am unsure on how to fix this issue. I have not been able to find any documention about this. This worked fine before switching to serializable carts.

Is it possible use RunWorkflow on Serializable Carts? Do workflows work with serializeable carts? Do I need to cast this to some other type or use a different approach?

public static WorkflowResults RunWorkflowExtended(this IOrderGroup orderGroup, string workflowName, Dictionary<string, object> param = null)
        {
            var OrderGroup = (OrderGroup)orderGroup;
            if (orderGroup == null)
            {
                return new WorkflowResults(null, WorkflowStatus.Aborted, new ArgumentNullException(nameof(orderGroup)));
            }

            if (string.IsNullOrWhiteSpace(workflowName))
            {
                return new WorkflowResults(null, WorkflowStatus.Aborted, new ArgumentNullException(nameof(workflowName)));
            }
            if (string.Equals(orderGroup.Name, Cart.WishListName, StringComparison.OrdinalIgnoreCase))
            {
                return new WorkflowResults(null, WorkflowStatus.Aborted, new ArgumentException(nameof(workflowName)));
            }

            OrderGroup.ProviderId = "frontend";

            var workflowResults = param != null ? OrderGroup.RunWorkflow(workflowName, false, param) : OrderGroup.RunWorkflow(workflowName, false);
            if (workflowResults.Exception != null)
            {
                var workflowWarnings = OrderGroupWorkflowManager.GetWarningsFromWorkflowResult(workflowResults);

                Logger.Error(string.Join(Environment.NewLine, workflowWarnings), workflowResults.Exception);
            }

            ServiceLocator.Current.GetInstance<IOrderRepository>().Save(orderGroup);

            return workflowResults;
        }