Why is a TypeBuilder generated generic methodinfo not a generic method?

I have some code that uses a MethodInfo of a generic method found on a generated type. To avoid some reflection, I have the code use the

ldtoken Method
ldtoken Type
call GetMethodFromHandle(RuntimeMethodHandle,RunTimeTypeHandle)

Pattern to generate the MethodInfos at compile time.

However, if the methodInfo belongs to a generic type and itself is a generic method things get screwy. Here is some code that simply generates a GM that emits an open version of its methodInfo. If I call it to retrieve the method than try to close it over a specific type I get a perplexing exception::

System.Reflection.MethodInfo GM[M]() is not a GenericMethodDefinition. MakeGenericMethod may only be called on a method for which MethodBase.IsGenericMethodDefinition is true.

Here is the relevant code::

var aBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly(new AssemblyName("Test"), AssemblyBuilderAccess.RunAndSave);
var mBuilder = aBuilder.DefineDynamicModule(aBuilder.GetName().Name, true);
var typeBuilder = mBuilder.DefineType("NameSpace.Generic`1",TypeAttributes.AutoClass | TypeAttributes.Sealed | TypeAttributes.Public,typeof(object));
var TypeGenerics = typeBuilder.DefineGenericParameters(new[] { "T" });
var methodBuilder = typeBuilder.DefineMethod("GM", MethodAttributes.Public | MethodAttributes.Static | MethodAttributes.HideBySig);
var methodGenerics = methodBuilder.DefineGenericParameters(new[] { "M" });
methodBuilder.SetSignature(typeof(MethodInfo), null, null, Type.EmptyTypes, null, null);
var ilgenerator = methodBuilder.GetILGenerator();
var typeBuilderClosedOverT = typeBuilder.MakeGenericType(TypeGenerics);
ilgenerator.Emit(OpCodes.Ldtoken, methodBuilder);
ilgenerator.Emit(OpCodes.Ldtoken, typeBuilderClosedOverT);
ilgenerator.Emit(OpCodes.Call, 
    typeof(MethodBase).GetMethod(
        "GetMethodFromHandle", 
        BindingFlags.Public | Bin