[XeTeX] xetex and xelatex bug in MiKTeX 2.9

[Vafa Khalighi]

Several users has reported that xetex and xelatex included in MikTeX 2.9
(and perhaps MiKTeX 2.8) is buggy. The minimal document is:

\documentclass{article}
\usepackage{fontspec}
\setmainfont[Script=Arabic,Mapping=parsidigits]{XB Zar}% replace it with any
other Arabic/Persian font that you have
\usepackage{bidi}
\setRTL
\begin{document}
\begin{equation}
1+2=3
\end{equation}
\end{document}

The reported problem is that equation number does not appear in the PDF. Can
anyone confirm this and if yes, would this be fixed in MiKTeX 2.9 (and
perhaps in MiKTeX 2.8).

Thanks
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