Mismatch Data Types Fixed-Point Tool Simulink

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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

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