STIXGeneral was originally added to our font stack to work around a bug in Chrome (https://bugs.chromium.org/p/chromium/issues/detail?id=591346) which caused some obscure combining marks to render as tofu. However, because STIXGeneral unexpectedly has glyphs for a handful of common Japanese characters, it's ended up making Japanese text in Element look patchy. I previously attempted to fix this by prioritizing sans-serif over STIXGeneral, but as is evident from our screenshot tests and user reports, this is still not enough on some systems to get Chrome to pick a consistent font for Japanese. On the basis that i18n is more important than supporting a few mathematical diacritics, I propose we remove the font. STIXGeneral is deprecated anyways, so if we want to get these diacritics back there's always the option of looking at its successor, STIXTwo.