Xelatex font use causes new error: '\__prop_put_linked:wnnN doesn't match its definition'

[Tom Wood]

I came across a new bug this morning. This:


\documentclass[american]{article}

\usepackage[T1]{fontenc}

\usepackage[utf8]{inputenc}

\usepackage{babel}

\begin{document}

Test

\end{document}


Renders a pdf just fine. But this


\documentclass[american]{article}
\usepackage{fontspec}
\setmainfont[Mapping=tex-text]{Minion Pro}
\usepackage{polyglossia}
\setdefaultlanguage[variant=american]{english}
\begin{document}
Test
\end{document}


returns he error


! Use of \__prop_put_linked:wnnN doesn't match its definition.


Is this a known issue?

Thanks!

Thomas Wood
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