多语言章节名称在 XeLaTeX 中不起作用

Question

请参阅下面给出的 MWE，其中我们使用两种语言。英语是主要语言，孟加拉 是第二语言。

\documentclass[11pt]{article}

\usepackage{polyglossia}
\setmainlanguage{english}
\newfontfamily\englishfont{Times New Roman}
\setotherlanguage[numerals=Devanagari]{bengali}
\newfontfamily\bengalifont[Script=Bengali,AutoFakeBold=4.0,AutoFakeSlant=0.4]{SolaimanLipi}
\newfontfamily\bengalifontbf[Script=Bengali,AutoFakeBold=4.0,AutoFakeSlant=0.4]{SolaimanLipi}
\newfontfamily\bengalifonttt[Script=Bengali,AutoFakeBold=4.0,AutoFakeSlant=0.4]{SolaimanLipi}
\newfontfamily\bengalifontsf[Script=Bengali,AutoFakeBold=4.0,AutoFakeSlant=0.4]{SolaimanLipi}

\begin{document}

English text.

% Languages switching works fine in normal text.
\begin{bengali}
   বাংলা লেখা
\end{bengali}

% Languages switching fails in section name.
\section{English text \begin{bengali}বাংলা লেখা\end{bengali}}

% Even protecting does not work
\protect{\section{English text \begin{bengali}বাংলা লেখা\end{bengali}}}

\end{document}

编译时，我们收到一条错误消息：

! Argument of \@sect has an extra }.
<inserted text> 
                \par 
l.22 ...বাংলা লেখা\end{bengali}}

我们怎样解决这个问题？