In the course of creating the mobile features for my (forthcoming) "Random select answers" question type I've come across a small display bug in the mobile App: The quiz questions: choice texts are not aligned with numbering!
There may be other types of question (or activities) concerned with this bug, but here is one example with the standard MULTICHOICE question type. As displayed on the attached screenshots, in the ".core-format-text .core-format-text-content" CSS rule, replacing "display: contents" with "display: flex" fixes the bug. But there might be unwanted side effects. I've tried to over-ride this in my own styles_app.css, but it does not work.