Browser auto-translate crashing the app
Chrome auto-translate rewrites text nodes underneath React's reconciler, which then throws a DOM exception removing children it no longer recognises. Fixed with translate="no".
Only visible by using it
Invisible to a code read. Found by being the real user, on a real device, at a real width.
Chrome's page translation rewrites text nodes in place, underneath React's reconciler, which then tries to remove or replace children that aren't the nodes it remembers. The app dies with a DOM exception that looks like a React bug and isn't one. translate="no" on all three index.html files. It'll never reproduce in a test environment — it needs a real user whose browser language differs from the page's.