How do I solve the Model reference argument problem?

Hello, I'm trying to replace the Simulink model that use Embedded Coder R2014b with R2018a.

When I simulate the model using Model Reference Arguments in R2014b, it works.

Unfortunately, when I simulate the model in R2018a, it doesn't work because of the non-tunable parameter 'Delay Length' of the discrete 'Delay' block.

In the referenced model, I use Accelerator mode to simulate the model.

I make the Simulink.Parameter to use model reference arguments. And then I use the parameter in each referenced Model Workspace.

So, I changed referenced model parameter (simulink.Parameter) as shown below. But it still does not work.

% enginenseframeparam.CoderInfo.StorageClass = 'ImportedExtern';
enginenseframeparam.CoderInfo.StorageClass = 'SimulinkGlobal';
% enginenseframeparam.CoderInfo.StorageClass = 'Auto

If you are familiar with this cause, could you give me some advice? Thank you for your advice.