Beamer: only within uncover

I have a nested itemize within another itemize on a Beamer frame. I’d like to create an overlay that wouldn’t have the "Test 2" item on the first slide at all, but would have it on the second slide, with the "Test 1" item grayed out. I tried this:

documentclass{beamer}

setbeamercovered{transparent}

usepackage{cmap}

usepackage[T2A]{fontenc}
usepackage[utf8]{inputenc}
usepackage[english]{babel}

begin{document}

begin{frame}
frametitle{Test}
begin{itemize}
item<1> Test 1
begin{itemize}
item<only@2> Test 2
end{itemize}
end{itemize}
end{frame}

end{document}

But the "Test 2" item is grayed out on the second slide, which is not what I want. Could you please help me solve this one?

documentclass{beamer}

setbeamercovered{transparent}

begin{document}

begin{frame}
  frametitle{Test}
  begin{itemize}
    item uncover<1>{Test 1}
      begin{itemize}
        item<visible@2> Test 2
      end{itemize}
  end{itemize}
end{frame}

end{document}