pdf_pageobject_ref.lvt

\PassOptionsToPackage{enable-debug,check-declarations}{expl3}
\RequirePackage[debug]{pdfmanagement}
\DeclareDocumentMetadata {  }
\RequirePackage{pdfmanagement-regressiontest}
\documentclass{article}
\begin{document}\START
abc
\ExplSyntaxOn
\tl_set:Nx \l_tmpa_tl{\__pdf_backend_pageobject_ref:n{1}}
\tl_show:N\l_tmpa_tl
\ExplSyntaxOff
\end{document}