\begin{<lang>} \include{<file>} \end{<lang>} not working at the end of a file

[Letinain]

Here is a MWE :

• test.tex

  \documentclass{minimal}
  \usepackage{polyglossia}
  \setmainlanguage{english}
  \begin{document}
  \begin{english}
  \include{test2}
  \end{english}
  \end{document}

• test2.tex : dummy file with any text (currently a)

This example seems a bit dubious but I encountered this problem when I wanted to switch the last include in my file to another language than the main one.

The error given is : ! Missing } inserted. <inserted text> } l.9 \end{document}

Notice that inserting \null right before the \end{document} seems to fix the compilation issue, and it adds an empty page.

My version of Polyglossia is 1.53 (2021/04/12).

[jspitz]

This works with a current version of polyglossia, so I assume the bug has been fixed in the meantime.

Please reopen if you can reproduce after upgrading.