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I'm trying to typeset some slides with text in either Bitstream Vera Sans or DejaVu Sans and maths in Fira Math using LuaLaTeX and unicode-math. When using Bitstream Vera Sans, everything works fine (except for the many glyphs missing in Fira Math):

Bitstream Vera Sans

When using DejaVu Sans, on the other hand, subscripts don't:

DejaVu Sans

What could be the cause of the difference?

\documentclass{minimal}
\usepackage{unicode-math}
\setmathfont{Fira Math}
% \setmathfont[range=up/{latin,Latin}]{Bitstream Vera Sans}
% \setmathfont[range=it/{latin,Latin}]{Bitstream Vera Sans Oblique}
\setmathfont[range=up/{latin,Latin}]{DejaVu Sans}
\setmathfont[range=it/{latin,Latin}]{DejaVu Sans Oblique}
\begin{document}
\[ a_i \]
\end{document}
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    looks okay here. Is your system up-to-date? – Ulrike Fischer Oct 24 '20 at 21:35
  • TeXLive 2020, as packaged by Norbert for Debian Unstable. – jch Oct 24 '20 at 21:41
  • I can’t reproduce the bug on my own box. What version of DejaVuSans.ttf does otfinfo -i report? – Davislor Oct 24 '20 at 22:08
  • Version 2.37 (for both the regular and oblique variants). As an additional element, the issue doesn't occur if I remove the up substitution, even though the up shapes are not used in the sample document. – jch Oct 24 '20 at 22:10

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