How do I get parameter names for both getter and setter when using TypeLibConverter?

Question

I need to parse a type library and analyze parameters of each method of each interface. So I use TypeLibConverter.ConvertTypeLibToAssembly() to convert ITypeLib into an AssemblyBuilder and call GetTypes() to access the types in the interop. I pass None as flags into ConvertTypeLibToAssembly().

Now in the typelib a had a dual interface with an int property Magic:

[propget, id( 1 )]
HRESULT Magic( [out, retval] int* Result );
[propput, id( 1 )]
HRESULT Magic( [in] int NewValue );

and in the resulting assembly the matching interface has two methods - one is

Int32 get_Magic()

and the other is

Void set_Magic( Int32 Result )

You see - the getter now has no parameters and so I can't get to the original parameter name and the setter simply has wrong name (one which the getter had).

What am I doing wrong?