"extract" package causes unfinished group

Question

I've noticed errors like this when using the extract package:
(end occurred inside a group at level 1)

### semi simple group (level 1) entered at line 5 (begingroup)

This seems to happen even with an almost empty document, for example:
documentclass{article}

usepackage[generate=foo.ext]{extract}

begin{document}
Hello!
end{document}

Would anyone have an idea why extract (extract 2019/09/18 v1.9a) is causing that error, and how to fix it?

Hendri · Answer

extract was created in 2005, long before any hook system was even discussed. So the new LaTeX destroyed the extract package.
As I am not using LaTeX anymore for a long time, and I have no clue about the changes in LaTeX that destroyed extract, it will probably a better idea if someone else has a look at the problem. Ulrike Fisher? I can integrate the required changes in the package and post it to CTAN.

"extract" package causes unfinished group

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