Follow-up Comment #2, bug #337 (project tex4ht):
Better solution is provided in my updated answer on TeX.sx. In LaTeX sources,
\_ macro is defined as:
\DeclareRobustCommand{\_}{%
\ifmmode\nfss@text{\textunderscore}\else\textunderscore\fi}
as you can see, \textunderscore is used also in math mode. I've modified it to
use \mathunderscore, for which I also mathml fix.
I've updated the sources.
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