Consider the following immutable class:

public class C 
{
    public C(int x)
    { 
        X = x; 
    }    

    public static C Default { get; } = new C(0);
 
    public int X { get; }
}

The ImmutableTypeClassMapConvention refuses to map such a class, because when obtaining the properties of a type, it calls the GetProperties method with no parameters. According to the MSDN documentation, both instance and static properties of a type are returned in this case. 

The suggested fix is to consider instance properties only by setting the correct BindingFlags.