[luatex] MWE now failing with recent TeX Live update

[Scott Kostyshak]

Dear all,

A document that used to compile for me fails after a recent TeX Live
update. I have no idea what the source of the problem is and thus I have
no idea if it is something in LuaTeX's code that changed that cause the
document to start failing or if it is somewhere else that I should look,
but in either case I figure it is a good idea to check here.

Here is a minimal example:

----------
\documentclass{article}
\usepackage{polyglossia}
\setdefaultlanguage{english}
\setotherlanguage{latin}
\begin{document}
\begin{latin}
Lorem ipsum dolor
\end{latin}
\end{document}
----------

Compiling with the command 'lualatex' gives me the following error:

----------
! You can't use `\relax' after \the.
<recently read> \l at latin 
         
l.66 \ifluatex\xpg at set@language at luatex@ii{latin}
                                              \fi
----------

Best,

Scott
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