generics - C# COM interface not visible when genericity is involved -

i work on professional project lot of com involved, , encounter following issue:

with code:

[comvisible(true)] public interface icomfakecall { }  [comvisible(false)] public class baseclass<t> { }  [comvisible(true)] public class comfakecall : baseclass<string>, icomfakecall { } 

the interface icomfakecall not visible excel vba editor.

whereas visible if remove genericity, :

[comvisible(true)] public interface icomfakecall { }  [comvisible(false)] public class baseclass { }  [comvisible(true)] public class comfakecall : baseclass, icomfakecall { } 

how come interface first example isn't visible?

is there known issue com objects , inheritance of generic classes?