Mismatch Data Types Fixed-Point Tool Simulink

Hello,

I am converting a Simulink model from floating-point to fixed-point. One of the subsystems in this model contains a Matlab Function.

The tool correctly proposes and applies the fixed-point types but when I simulate the model it tells me that there is a data mismatch after a signal enters in a unit delay block whose output goes into the Matlab Function. Basically the signal coming out from the delay block is a fixed-point one (and that is right) but then the Matlab function expects a double type. However, the input of the functione is correctly defined as a fixed-point type in the code I get after the proposal.

I'm attaching a couple of screenshots. I know it is a long question, hopefully someone can help me.

Thanks,

Matteo