When using LuaTeX, the CharacterVariant feature doesn't work for small font sizes such as \scriptstyle and \footnotesize. This problem doesn't occur with XeTeX.
✗ Relevant for XeTeX
✓ Relevant for LuaTeX
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Minimal example demonstrating the issue
\documentclass{article}
\usepackage{unicode-math}
\setmathfont{STIXTwoMath-Regular.otf}[CharacterVariant=3]
\begin{document}
$\varnothing$
% The following produce incorrect output:
$\scriptstyle\varnothing$
$\scriptscriptstyle\varnothing$
\footnotesize$\varnothing$
\scriptsize$\varnothing$
\tiny$\varnothing$
\end{document}
Further details
Compiling the above code yields the following output:
Description
When using LuaTeX, the
CharacterVariantfeature doesn't work for small font sizes such as\scriptstyleand\footnotesize. This problem doesn't occur with XeTeX.Minimal example demonstrating the issue
Further details
Compiling the above code yields the following output:
with LuaTeX
with XeTeX