Beamer slides with texlive can't find font for letters inside math formulas

System

• xuname: Void 5.14.16_1 x86_64-musl GenuineIntel notuptodate rDFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
• package:
  • texlive-fontsextra-2020.57042_1
  • texlive-20200406_10

Expected behavior

Running pdflatex test.tex, where test.tex contains the content below, successfully generates a PDF.

\documentclass[pdf]{beamer}

\mode<presentation>{}

\usepackage{amsmath}

\begin{document}

\begin{frame}{Title}
	Some math:
	\[1+y=2a\]
\end{frame}

\end{document}

Actual behavior

It errors out, I believe the relevant part of the error is:

[Loading MPS to PDF converter (version 2006.09.02).]
) (/usr/share/texmf-dist/tex/latex/epstopdf-pkg/epstopdf-base.sty
(/usr/share/texmf-dist/tex/latex/latexconfig/epstopdf-sys.cfg))
(/usr/share/texmf-dist/tex/latex/hyperref/nameref.sty
(/usr/share/texmf-dist/tex/latex/refcount/refcount.sty)
(/usr/share/texmf-dist/tex/generic/gettitlestring/gettitlestring.sty))
(./tf2.out) (./tf2.out)
(/usr/share/texmf-dist/tex/latex/translator/translator-basic-dictionary-English
.dict)
(/usr/share/texmf-dist/tex/latex/translator/translator-bibliography-dictionary-
English.dict)
(/usr/share/texmf-dist/tex/latex/translator/translator-environment-dictionary-E
nglish.dict)
(/usr/share/texmf-dist/tex/latex/translator/translator-months-dictionary-Englis
h.dict)
(/usr/share/texmf-dist/tex/latex/translator/translator-numbers-dictionary-Engli
sh.dict)
(/usr/share/texmf-dist/tex/latex/translator/translator-theorem-dictionary-Engli
sh.dict) (./tf2.nav) (/usr/share/texmf-dist/tex/latex/amsfonts/umsa.fd)
(/usr/share/texmf-dist/tex/latex/amsfonts/umsb.fd)
(/usr/share/texmf-dist/tex/latex/sansmathaccent/ot1mathkerncmss.fd) [1{/usr/sha
re/texmf-var/fonts/map/pdftex/updmap/pdftex.map}] (./tf2.aux)
kpathsea: Running mktexpk --mfmode / --bdpi 600 --mag 1+57/600 --dpi 657 mathkerncmssi10
mktexpk: don't know how to create bitmap font for mathkerncmssi10.
mktexpk: perhaps mathkerncmssi10 is missing from the map file.
kpathsea: Appending font creation commands to missfont.log.
 )
!pdfTeX error: pdflatex (file mathkerncmssi10): Font mathkerncmssi10 at 657 not
 found
 ==> Fatal error occurred, no output PDF file produced!

Running updmap -user --enable Map=sansmathaccent to generate a local font map is enough to fix this; maybe fixing the hooks is enough.

Start with the provided pdflatex test.tex example and the texlive-fontsextra-2020.57042_1 and texlive-20200406_10 package definitions. Compare the package hooks with the workaround command updmap -user --enable Map=sansmathaccent; done means the Beamer example generates a PDF without the missing mathkerncmssi10 error.