I encountered a similar issue while trying to package something with a texlive-union input. Tracking down the issue has killed way too many hours.
FWIW, the `working.tex' minimal example is also giving me similar problems: $ guix describe Generation 28 5月 07 2020 01:10:02 (current) guix bed695a repository URL: https://git.savannah.gnu.org/git/guix.git branch: master commit: bed695aa94cd85800ec2c6296fb2d13e7ac29133 $ guix environment --pure -e '((@ (gnu packages tex) texlive-union) `(,(@ (gnu packages tex) texlive-amsfonts)))' $ pdflatex working ... ! Math formula deleted: Insufficient symbol fonts. \) ->\relax \ifmmode \ifinner $ \else \@badmath \fi \else \@badmath \fi l.4 Hello! \(y = x^2\) ... With the patch to texlive-amsfonts the above typesets just fine; however, metafont ends up generating cmmi10.657pk and cmr10.657pk font files. Is this expected? Typsetting it from the texlive installation of my foreign distro doesn't call out to metafont at all.
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