Not rendered on ankiweb

[jeanpat]

Hello,
Some cards with mathjax code are rendered on ankidroid or on anki desktop (ubuntu) but not on ankiweb:

[abdo]

AnkiWeb fails to render MathJax

Although cards with MathJax content can render perfectly fine in Anki Desktop on macOS, when those cards are studied via AnkiWeb on a mobile device, the MathJax literally displays as “(z^{(l)}_j)” I decided to switch to MathJax because the documentation says: “LaTeX . . . is only recommended for users that need more features than MathJax provides.” It also says: “MathJax is a browser-based typesetting system.” I am using Safari on iOS 13.