afterpage: Information lost if page where afterpage is to place code is thrown away.

[jasperhabicht]

Brief outline of the bug

When using the afterpage package, information is lost when e.g. placing properties in \AtEndDocument (or \AddToHook{enddocument/afterlastpage}) if the page on which afterpage is to insert code remains blank and thus is thrown away.

Minimal example showing the bug

\RequirePackage{latexbug}
\documentclass{article}
\usepackage{lipsum, afterpage}

\ExplSyntaxOn
\property_new:nnnn { foo } { now } { 0 } { foo }

\AtEndDocument{
    \property_record:nn { myproperty } { foo }
}
\ExplSyntaxOff
    
\begin{document}
\afterpage{\enlargethispage{-20mm}}

\lipsum[1]

\ExplSyntaxOn    
\property_ref:nn { myproperty } { foo }
\ExplSyntaxOff

\end{document}

The output shows 0 instead of foo and the .aux file does not contain the property.

Log file (required) and possibly PDF file

afterpage-bug.pdf
afterpage-bug.log