The eqnarray and eqnarray* environments produce many -INNER entries without resolving to a correct final entry. I think there's just no specific support for it at the moment.
\DocumentMetadata
{
lang=en-US,
pdfversion=2.0,
pdfstandard=ua-2,
tagging=on,
% tagging-setup={math/setup=mathml-SE},
}
\documentclass{article}
\usepackage{unicode-math}
\begin{document}
\begin{eqnarray}
A&=&B\\
D&=&C
\end{eqnarray}
\begin{eqnarray*}
A&=&B\\
D&=&C
\end{eqnarray*}
\end{document}<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<div>
<h2>\mml 1</h2>
<p>\begin {eqnarray}A&=&B\\ D&=&C\end {eqnarray}</p>
<p>6C86C2DEC86D85E375FC17E76771BCBB-INNER</p>
<math xmlns="http://www.w3.org/1998/Math/MathML">
<mstyle displaystyle="true" scriptlevel="0">
<mi>𝐴</mi>
</mstyle>
</math>
</div>
<div>
<h2>\mml 1</h2>
<p>\begin {eqnarray}A&=&B\\ D&=&C\end {eqnarray}</p>
<p>6C86C2DEC86D85E375FC17E76771BCBB-INNER</p>
<math xmlns="http://www.w3.org/1998/Math/MathML">
<mi mathvariant="normal">=</mi>
</math>
</div>
<div>
<h2>\mml 1</h2>
<p>\begin {eqnarray}A&=&B\\ D&=&C\end {eqnarray}</p>
<p>6C86C2DEC86D85E375FC17E76771BCBB-INNER</p>
<math xmlns="http://www.w3.org/1998/Math/MathML">
<mstyle displaystyle="true" scriptlevel="0">
<mi>𝐵</mi>
</mstyle>
</math>
</div>
<div>
<h2>\mml 1</h2>
<p>\begin {eqnarray}A&=&B\\ D&=&C\end {eqnarray}</p>
<p>6C86C2DEC86D85E375FC17E76771BCBB-INNER</p>
<math xmlns="http://www.w3.org/1998/Math/MathML">
<mstyle displaystyle="true" scriptlevel="0">
<mi>𝐷</mi>
</mstyle>
</math>
</div>
<div>
<h2>\mml 1</h2>
<p>\begin {eqnarray}A&=&B\\ D&=&C\end {eqnarray}</p>
<p>6C86C2DEC86D85E375FC17E76771BCBB-INNER</p>
<math xmlns="http://www.w3.org/1998/Math/MathML">
<mi mathvariant="normal">=</mi>
</math>
</div>
<div>
<h2>\mml 1</h2>
<p>\begin {eqnarray}A&=&B\\ D&=&C\end {eqnarray}</p>
<p>6C86C2DEC86D85E375FC17E76771BCBB-INNER</p>
<math xmlns="http://www.w3.org/1998/Math/MathML">
<mstyle displaystyle="true" scriptlevel="0">
<mi>𝐶</mi>
</mstyle>
</math>
</div>
<div>
<h2>\mml 2</h2>
<p>\begin {eqnarray*}A&=&B\\ D&=&C\end {eqnarray*}</p>
<p>08812C4615B205AC4B685A8AAB3A63EC-INNER</p>
<math xmlns="http://www.w3.org/1998/Math/MathML">
<mstyle displaystyle="true" scriptlevel="0">
<mi>𝐴</mi>
</mstyle>
</math>
</div>
<div>
<h2>\mml 2</h2>
<p>\begin {eqnarray*}A&=&B\\ D&=&C\end {eqnarray*}</p>
<p>08812C4615B205AC4B685A8AAB3A63EC-INNER</p>
<math xmlns="http://www.w3.org/1998/Math/MathML">
<mi mathvariant="normal">=</mi>
</math>
</div>
<div>
<h2>\mml 2</h2>
<p>\begin {eqnarray*}A&=&B\\ D&=&C\end {eqnarray*}</p>
<p>08812C4615B205AC4B685A8AAB3A63EC-INNER</p>
<math xmlns="http://www.w3.org/1998/Math/MathML">
<mstyle displaystyle="true" scriptlevel="0">
<mi>𝐵</mi>
</mstyle>
</math>
</div>
<div>
<h2>\mml 2</h2>
<p>\begin {eqnarray*}A&=&B\\ D&=&C\end {eqnarray*}</p>
<p>08812C4615B205AC4B685A8AAB3A63EC-INNER</p>
<math xmlns="http://www.w3.org/1998/Math/MathML">
<mstyle displaystyle="true" scriptlevel="0">
<mi>𝐷</mi>
</mstyle>
</math>
</div>
<div>
<h2>\mml 2</h2>
<p>\begin {eqnarray*}A&=&B\\ D&=&C\end {eqnarray*}</p>
<p>08812C4615B205AC4B685A8AAB3A63EC-INNER</p>
<math xmlns="http://www.w3.org/1998/Math/MathML">
<mi mathvariant="normal">=</mi>
</math>
</div>
<div>
<h2>\mml 2</h2>
<p>\begin {eqnarray*}A&=&B\\ D&=&C\end {eqnarray*}</p>
<p>08812C4615B205AC4B685A8AAB3A63EC-INNER</p>
<math xmlns="http://www.w3.org/1998/Math/MathML">
<mstyle displaystyle="true" scriptlevel="0">
<mi>𝐶</mi>
</mstyle>
</math>
</div>
</html>
The
eqnarrayandeqnarray*environments produce many -INNER entries without resolving to a correct final entry. I think there's just no specific support for it at the moment.