References to begin and end of beamer allowframebreaks range

I’m using a table of contents in my beamer presentation, in which I include the first and the last slide number of each section. For this I place separate labels in the first and in the last slide, for example label{corpbeg} and label{corpend} and then I write

begin{frame}{Table of Contents}
begin{itemize}
item …
item Corpusdotfillref{corpbeg}--ref{corpend}
item …
end{itemize}
end{frame}

(A section always has more than one slide since it contains the section title frame and at least one slide of contents.)

The problem is that this approach does not work with the bibliography, where I’m forced to use allowframebreaks:

begin{frame}[allowframebreaks]{Bibliography}label{biblbeg}
bibliographystyle{plain}
bibliography{main}
label{biblend}
end{frame}

doesn’t work, I get the same number from ref{biblbeg} and ref{biblend} (i.e., begin and end of the bibliography), even though they are three frames apart.

How can I obtain a ref towards the last slide of three-page bibliography obtained with allowframebreaks?

MWE Proposal from Manuel

documentclass[hyperref]{beamer}

begin{document}

begin{frame}{Link Frame}
ref{myHyperLabelBegin}--ref{myHyperLabelEnd}    
end{frame}

begin{frame}[allowframebreaks, t, label=myHyperLabelBegin]
begin{itemize}
    item Test (First)
    item Test
    item Test
    item Test
    item Test
    item Test
    item Test
    item Test
    item Test
    item Test
    item Test
    item Test
    item Test
    item Test
    item Test
    item Test
    item Test
    item Test
    item Test
    item Test
    item Test (Last)
end{itemize}
label{myHyperLabelEnd}
end{frame}

end{document}