XeLatex, fontenc and makeindex question - possible XeLatex bug?

 
Hello, MikTex helpers,
 
I have a strange problem using XeLatex, fontenc and makeindex
with the font akkadian.ttf (available here:
http://users.teilar.gr/%7Eg1951d/Akkadian.zip )
But I do not think it matters what ttf font I am using with fontenc.


I am using
XeTeX, Version 3.1415926-2.3-0.9997.5 (MiKTeX 2.9) 

Here is the problem: 
The index does not show Unicode symbols because the "-character gets lost,
while the text shows them correctly.
 
Here is my minimum example:

%--------------------------------------
\documentclass{article}

\usepackage{fontspec}
\def\akk{\fontspec{Akkadian}\LARGE}
\usepackage{makeidx}
\makeindex

\begin{document}
Here it is a simple example
\par

blabla \\
\index{blabla}
{\akk blabl\symbol{"1E2B}}   \\
\index{{\akk blabl\symbol{"1E2B}}}
\index{{\akk blibl\protect\symbol{"1E2B}}}

\printindex
\end{document}
%--------------------------------------

The *.idx file looks fine, but the *.ind file has
{\akk blabl\symbol{1E2B}}
instead of
{\akk blabl\symbol{"1E2B}}
and that is why the symbol characters don't show up in the index.
The \protect statement does not help it either.

But if I insert the " into the *.ind file by hand, I get the index correctly.
Is that a possible bug?

Thanks in advance for any help.

Angelika

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