Superscript in combined subscript and superscript goes missing in "Copy as MathML"

[robert-dodier]

Working with wxMaxima 24.08.0 + Linux.

When I copy the display form of an expression such as x[k]^n as MathML (i.e., via menu item "Copy as MathML" on right click after highlighting the expression), the subscript is shown in the copied expression, but the superscript is missing. For x[k]^n, I get:

<math xmlns="http://www.w3.org/1998/Math/MathML">
  <semantics>
    <msubsup>
      <mo>x</mo>
      <mo>k</mo>
    </msubsup>
  </semantics>v
</math>

Note that msubsup is the output; that's correct, but it's missing its third argument, which is supposed to be the superscript. See: https://developer.mozilla.org/en-US/docs/Web/MathML/Element/msubsup

Note that x[k] and x^n are both correctly represented in MathML output, as

<math xmlns="http://www.w3.org/1998/Math/MathML">
  <semantics>
    <msub>
      <mo>x</mo>
      <mo>k</mo>
    </msub>
  </semantics>
</math>

and

<math xmlns="http://www.w3.org/1998/Math/MathML">
  <semantics>
    <msup>
      <mo>x</mo>
      <mo>n</mo>
    </msup>
  </semantics>
</math>

respectively.

For an example of this bug in an actual document, see #1942.

[robert-dodier]

Also, superscript in combined superscript and subscript goes missing when I select "Copy" (first item on right click menu) and then paste into MS Word. The pasted item becomes an equation and the superscript is replaced by a small empty square.

[daute]

I fixed the 'Copy as MathML' issue now (and closed the issue). Concerning the simple "Copy" - then I have
x[k]^n in the clipboard - that should be correct? What else?