Bug in reading <mtext>

[TimArborealis]

I've come across a few cases where a word in an <mtext> tag is not read as a word, but spelled out letter by letter. It only happens occassionally, and I have not been able to identify a pattern.

A couple of examples follow.

Markup:

<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
  <msub>
    <mi mathvariant="normal">H</mi>
    <mn>2</mn>
  </msub>
  <mi mathvariant="normal">O</mi>
  <mo>+</mo>
  <mtext>energy</mtext>
</math>

Output from NVDA:s speech log: "h 2 o plus e n e r g y"

Markup:

<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
  <msub>
    <mi mathvariant="normal">H</mi>
    <mn>2</mn>
  </msub>
  <mo>+</mo>
  <mtext>energy</mtext>
</math>

Output from speech log: "h 2 plus energy"

I get the same results in Swedish and English, regardless of verbosity setting. I have tried with different words and words separated by spaces, with similar results.