> ref. https://github.com/latex3/latex2e/issues/1804
>
> LuaTeX handles images in --output-directory differently depending on whether
> the Lua functions or the TeX interface is used. Essentially, with
>
> mkdir -p tex-aux
> cp $(kpsewhich example-image-a.pdf) tex-aux/example-delwedd-a.pdf
> cp $(kpsewhich --var-value TEXMFDIST)/tex/context/sample/common/cow-black.mps
> tex-aux/moo.mps
>
> then
>
> \directlua{
> img.write = { filename = "example-delwedd-a.pdf" }
> }
> \bye
>
> works with --output-directory=tex-aux, whereas
>
> \saveimageresource{example-delwedd-a.pdf}
> \useimageresource\lastsavedimageresourceindex
> \bye
>
> does not.
>
> I can't reproduce the discrepancy with LuaTeX from TL 2022, but I can from TL
> 2023 and also with LuaTeX dev TL2026. The error does not occur if pdfTeX is
> used.
>
> In LuaLaTeX, this causes fatal errors as LuaHBTeX finds the file when
> \includegraphics checks, but cannot find the image when \includegraphics
> tries to use it.
>
> Logs and details in the GitHub issue linked above.
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