MathSpeak speaking words in <mi> elements as individual letters

[brichwin]

Using either MathJax 3.2.2 or 4.0.0-beta.3 when generating speech text for LaTeX that generates multi-char <mi> content, MathSpeak grammar of any verbosity inappropriately spaces runs of non-space text sequences into individual characters. For example, for the following expression: $h_{\text{per mole in kJ}} = 3.99 \times 10^{-13} \mathrm{kJ} \times \mathrm{s} \times \mathrm{mol}^{-1}$,
notice that the text generated for the \mathrm{mol} part of h_{\text{per mole in kJ}} = 3.99 \times 10^{-13} \mathrm{kJ} \times \mathrm{s} \times \mathrm{mol}^{-1}, is "m o l" when the SRE is configured for MathSpeak brief:

h Sub per mole in kJ Base equals 3.99 times 10 Sup negative 13 Base k upper J times normal s times m o l Sup negative 1

This is instead of the expected:

h Sub per mole in kJ Base equals 3.99 times 10 Sup negative 13 Base k upper J times normal s times mol Sup negative 1

View the MathML MathJax created for the example

<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
  <msub>
    <mi>h</mi>
    <mrow data-mjx-texclass="ORD">
      <mtext>per mole in kJ</mtext>
    </mrow>
  </msub>
  <mo>=</mo>
  <mrow>
    <mn>3.99</mn>
    <mo>&#xD7;</mo>
    <mrow>
      <msup>
        <mn>10</mn>
        <mrow data-mjx-texclass="ORD">
          <mo>&#x2212;</mo>
          <mn>13</mn>
        </mrow>
      </msup>
      <mo>&#x2062;</mo>
      <mrow data-mjx-texclass="ORD">
        <mi data-mjx-auto-op="false">kJ</mi>
      </mrow>
    </mrow>
    <mo>&#xD7;</mo>
    <mrow data-mjx-texclass="ORD">
      <mi mathvariant="normal">s</mi>
    </mrow>
    <mo>&#xD7;</mo>
    <msup>
      <mrow data-mjx-texclass="ORD">
        <mi data-mjx-auto-op="false">mol</mi>
      </mrow>
      <mrow data-mjx-texclass="ORD">
        <mo>&#x2212;</mo>
        <mn>1</mn>
      </mrow>
    </msup>
  </mrow>
</math>

Note that ClearSpeak Auto for the same expression correctly returns "mol":

h sub per mole in kJ equals 3.99 times 10 to the negative 13 power kJ times normal s times mol to the negative 1 power

[brichwin]

Side question: Is there a more appropriate way to encode units in LaTeX expressions for MathJax (so the mi elements are generated with mathvariant='normal' class='MathML-Unit')?