Hello there, fixed the issue by downgrading to version 2 of Mathjax. So it’s an issue of MathJax V3, nothing to do with your plug-in.
I had a custom configuration code for version 3 to include the cancel package, that prevented me to successfully downgrade to version 2 until now. Didn’t rewrite code for version 2, simply put an \require{cancel} in the preamble.
I’ll have to tell the Mathjax development team about the problem I guess. Bye and again, thanks for your work!