Does reference counting still works with Delphi Interfaces when you don't provide a guid?

I have the following interface:

type IDataAccessObject<Pk; T:class> = interface
   getByPrimaryKey(key: PK) : T;
   //... more methods
end;

And an implementation of the interface as follows:

type TMyClassDAO = class(TInterfacedObject, IDataAccessObject<integer, TMyClass>)
   getByPrimaryKey(key:integer) : TMyClass;
   // more methods
end;

Note that I am not providing a guid for the interface (because every instantiation of the previous generic interface is a different interface and they should not share the same guid). However I am not sure whether that does not break reference counting implemented by TInterfacedObject?