Custom methods not triggered when having File as a parameter

[adamsosinski]

I'm using a .Net Standard 2.0 Class Library where I have a .tst template for generating .ts files based on classes with DTOClass attribute. I have created a method that has a File as a parameter, yet it is not triggered and just rendered as-is. Please find the below example.

template

${
/// ...
    string PrintDebug(File f){
        return f.FullName;
    }
/// ...
}
$PrintDebug

produce

$PrintDebug

Is there some configuration that I'm missing or something else is the issue?
I will appreciate any help on this.