Loading luamml changes math hat alignment in some interesting way that depends on whether one uses \hat f or \hat{f} syntax. The issue persists over various fonts, but it's easiest to see with the following minimal example.
% !TEX program = lualatex
\documentclass{article}
\usepackage{unicode-math}
\usepackage{luamml}
\begin{document}
$\hat f$ should look exactly like $\hat{f}$
\end{document}Here's a screenshot of the output, showing the misalignment of the second syntax for the f-with-hat.
Commenting out the line \usepackage{luamml} results in the correct appearance of the second f-with-hat.
I'm compiling on a mac January 26 2026 with a fully-updated texlive 2025 install, some relevant lines from the log include
This is LuaHBTeX, Version 1.22.0 (TeX Live 2025) (format=lualatex 2026.1.23) 26 JAN 2026 15:27
...
Package: luamml 2025-10-20 v0.7.0 Automatically generate presentational MathML
I encountered this issue while experimenting with tagging. Originally I triggered it by including \DocumentMetadata with tagging=on and other settings that caused luamml to be loaded.
Loading luamml changes math hat alignment in some interesting way that depends on whether one uses
\hat for\hat{f}syntax. The issue persists over various fonts, but it's easiest to see with the following minimal example.Here's a screenshot of the output, showing the misalignment of the second syntax for the f-with-hat.
Commenting out the line
\usepackage{luamml}results in the correct appearance of the second f-with-hat.I'm compiling on a mac January 26 2026 with a fully-updated texlive 2025 install, some relevant lines from the log include
I encountered this issue while experimenting with tagging. Originally I triggered it by including
\DocumentMetadatawithtagging=onand other settings that caused luamml to be loaded.