似乎主要的问题是必须首先扩展.我猜你是这么做的，因为MathJax在RTL上下文中渲染太大.

It seems like the main issue is that you have to scale in the first place. I'm guessing you did that because MathJax is rendering too large in RTL contexts.

MathJax似乎在检测周围字体的正确ex-height时遇到问题.这可能是由各种问题引起的，从字体高度不正确到CSS交互不良.通过快速测试，它不是字体.

It looks like MathJax is having issues detecting the correct ex-height of the surrounding font. That can be caused by various problems, from fonts not having a correct ex-height to bad CSS interactions; from a quick test it's not the fonts.

作为解决方法，您可以在MathJax配置中禁用字体匹配

As a workaround you can disable font matching in the MathJax configuration

MathJax.Hub.Config({
     "HTML-CSS": {matchFontHeight: false},
     SVG: {matchFontHeight: false},
     CommonHTML: {matchFontHeight: false}
});

然后，您还应该禁用所应用的缩放比例.

You should then also disable the scaling you applied.