Can't get required css when I use tex2chtml and chtmlStylesheet in Node.js

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Issue Summary

Can't get required css when I use tex2chtml and chtmlStylesheet in Node.js

Steps to Reproduce:

1. try to render Latex string \frac {25}{8} 800 2800

        const MathJax = await mathjax.init({
            chtml: {
                fontURL: 'https://cdn.jsdelivr.net/npm/mathjax@3/es5/output/chtml/fonts/woff-v2/',
                adaptiveCSS: true
            }
            loader: {load: ['input/tex', 'output/chtml']},
        })
        const chtml = await MathJax.tex2chtml('\\frac {25}{8} 800 2800');
        const adaptor = MathJax.startup.adaptor;
        const outerCSS = adaptor.textContent(MathJax.chtmlStylesheet());
        const outerhtml = await adaptor.outerHTML(chtml);

3. compared with css which output by web client，I found some css lines are missing:

mjx-c.mjx-c32::before {
  padding: 0.666em 0.5em 0 0;
  content: "2";
}

mjx-c.mjx-c35::before {
  padding: 0.666em 0.5em 0.022em 0;
  content: "5";
}

mjx-c.mjx-c38::before {
  padding: 0.666em 0.5em 0.022em 0;
  content: "8";
}

mjx-c.mjx-c30::before {
  padding: 0.666em 0.5em 0.022em 0;
  content: "0";
}

Any other information you want to share that is relevant to the issue
being reported. Especially, why do you consider this to be a bug? What
do you expect to happen instead?

Technical details:

• MathJax Version: 3.2.2
• Client OS: Mac OS X 13.4.1
• Nodejs: v16.18.0

Supporting information:

• Please supply a link to a (live) minimal example page, when possible.
• If your issue is with the display of the mathematics produced by MathJax, include a screen snapshot that illustrates the problem, when possible.
• Check your browser console window for any error messages, and include them here.
• Include the MathJax configuration you are using, and the script tag that loads MathJax itself.