Heads up:

The LaTeX package extract, used in the draft document, seems to intrude into private parts of the implementation of LaTeX, with high potential of breaking stuff. Compiling std.pdf emits nasty warnings at the end of the process:

(\end occurred inside a group at level 1)

### semi simple group (level 1) entered at line 86 (\begingroup)
### bottom level 

Latexmk marks these warnings as "very important" (it might have been some different but equivalent wording, not sure).

See https://tex.stackexchange.com/questions/605890/extract-package-causes-unfinished-group

the package redefines \begin and \end and completly breaks the new hook system of LaTeX, I wouldn't use it.

Write the author. He probably can use the new hooks instead of destroying them, or he could ask for real interfaces instead of redefining internal commands.

extract was created in 2005, long before any hook system was even discussed. So the new LaTeX destroyed the extract package.