long division is not properly displayed(Uncaught TypeError: Cannot read properties of undefined (reading 'dataset'))

Created by: henok-outlier

Issue Summary

<math xmlns="http://www.w3.org/1998/Math/MathML">
    <mlongdiv charalign="center" charspacing="0px" stackalign="left">
        <mn>8</mn>
        <mrow>
            <none></none>
            <mn>3</mn>
        </mrow>
        <msgroup>
            <mn>251</mn>
            <msrow>
                <menclose notation="bottom">
                    <mn>2</mn>
                </menclose>
                <menclose notation="bottom">
                    <mn>4</mn>
                </menclose>
            </msrow>
            <msrow>
                <none></none>
                <mn>1</mn>
            </msrow>
        </msgroup>
    </mlongdiv>
</math>

I've this MahtML generated from CKEditor4 mathtype, and want to render in the FE using Mahtjax.

Uncaught TypeError: Cannot read properties of undefined (reading 'dataset')

Steps to Reproduce:

Open https://www.mathjax.org/#demo
Copy the above mathml to the input
Mathype input error will show up

Technical details:

Mathjax: https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.7/MathJax.js?config=TeX-MML-AM_SVG Client OS: Mac OS X 11.4 Browser: Chrome Version 94.0.4606.71 (Official Build) (x86_64)

Supporting information:

Thee formula is not correctly displayed and there's an error in the console

But this is how the same formula is displayed in Mathtype,