Is it there a way to show all keys in eps schemes with chemnum?

Question

I find the show-keys feature from chemnum super handy, as it allows me to keep track of all the plenty compounds I use throughout my document. But I ran into a hiccup, which I could not resolve: If I replace keys in .eps schemes generated by ChemDraw, the document crashes, when I use the option true or def. It does work with the option ref, but shows me the keys I declare in the scheme itself, not the referenced ones as indicated by the name. Plus, I need to use \replacecmpd+{key} to not crash the compilation. Outside the scheme, everything works fine and as intended. Is there a way to show all the keys in the scheme?

I just noticed while playing around, that the keys are being put into margin, when having them defined, could that be the cause for the crash? If yes, i would be fine with all the keys being put inside the scheme, similar to the refversion. I have no idea though, how to do it :D

\documentclass[english,
10pt,
]{scrreprt}
\usepackage{chemmacros}
\usechemmodule{
    spectroscopy,
    scheme,
    nomenclature,
    mechanisms,
    isotopes,
}
\setchemnum{
    replace-tag={X},%X<#> used as template tag, better visualization in chemdraw file than TMP<#>
    show-keys=ref,
}
\usepackage[runs=2]{auto-pst-pdf}
\begin{document}
Here the numbers are defined: \cmpd{Garner_02} and \cmpd{Garner_04}
\begin{scheme}[htb]
    \centering
    \replacecmpd{Boc-ser-OMe}
    \replacecmpd+{Garner_02}
    \replacecmpd+{Garner_04}
    \replacecmpd{Garner_22}
    \includegraphics[scale=0.7]{garner_rxn}
    \caption{Synthesis of Garner's aldehyde~\cmpd+{Garner_04} and the corresponding Weinrebamide~\cmpd+{Garner_22}.}
\end{scheme}
Here they are referenced: \cmpd{Garner_02} and \cmpd{Garner_04}
\end{document}

with the eps here (hopefully)