I'm using Firefox on Flatpak (version 146.0.1). If you refresh the page or access it using a link, the math of the article stops getting rendered for some equations.
The only warning I see is this, but it also appears when you don't have to hydrate the page (when you get the article from the json): downloadable font: Glyph bbox was incorrect (glyph ids 18 65 85 110 112 115 117 120 133 195) (font-family: "KaTeX_Main" style:normal weight:400 stretch:100 src index:0) source: https://open.ibis.wiki/fonts/KaTeX_Main-Regular.woff2