mml3 still not work in MathJax3.2

Created by: weihaopeng

Issue Summary

Follow the experimental mml3 extension, I add the loader in my MathJax configuration. Then in page, the mml3.js is loaded, but the mathml using mlongdiv is not rendered correctly.

Steps to Reproduce:

• The code example.
• This is what I expect and what it is.
• 
• And the request of mml3.js file is successful.
• 

Technical details:

• MathJax Version: 3.2
• Client OS: Windows10
• Browser: Chrome 91.0.4472.101

Supporting information:

• Script tag:

•  <script>
     window.MathJax = {
           options: {
             renderActions: {
               addMenu: [0, '', '']
             }
           },
           chtml: {
             matchFontHeight: false,
             adaptiveCSS: false
           },
           loader: {load: ['input/asciimath', 'output/chtml', '[mml]/mml3']}
         };
   </script>
   <script src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/mml-chtml.js"></script>