We are using Native .NET API from IRISProviderCore21 package, inside .NET Core app, and having issue when trying to call function that takes instance of the class as parameter. The server is IRIS 2020.1.0.217.1

In a nutshell, the code looks like this:

// Create instance of the parameter class, proxy object

var paramObject = iris.ClassMethodObject("MyParameterClass", "%New") as IRISObject;

paramObject.Set("property", "value");