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mountedRef was initialized to true but never reset on mount. The cleanup function (useEffect return) set it to false on unmount. In React 18 Strict Mode, components mount-unmount-remount during dev. After the first cleanup, mountedRef stayed false forever. Result: handlePunch set submitting=true, geolocation callbacks fired, but every callback returned early at `if (!mountedRef.current) return` before calling submitPunch. No server request, button stuck. Fix: add `mountedRef.current = true` inside the useEffect body. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>