Typesetting the same content results in nested assistive content

Created by: fast-reflexes

Issue Summary

Every time the same content is typeset anew with MathJax.typesetPromise(), the assistive math tag gets a nested version of the math content itself.

Steps to Reproduce:

Go to https://codesandbox.io/s/better-react-mathjax-20-m8uf2c

1. Let the page load, check the assistive mml subelement of the content typeset on startup.
2. Click TYPESET and observe what change occurs in the assistive math element (it gets a nested version of the math element itself)
3. Do it again to observe a further nesting in the assistive element.

No matter if typesetClear is used or not, this is the resulting behaviour.

I would expect the assistive element to look the same after typesetting anew.

Technical details:

• MathJax Version: 3.2.1
• Client OS: MacOS Catalina 10.15.7
• Browser: Chrome Version 103.0.5060.53 (Official Build) (x86_64)

I am using the following MathJax configuration:

DEFAULT (e.g. typesetting on startup)

and loading MathJax via

<script src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js"></script>