Demo: State Chaos β€” Where Does Truth Live?

πŸ“š Medical Terminology Course

πŸ” State Inspector

βš›οΈ Component State

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🧠 useCallback (submit)

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πŸ–₯️ Server

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Event Log

How to trigger the bug
  1. Go to the Quiz step β€” this creates the submit handler with proMode=false
  2. Click "Need a hint?" link on the quiz (opens new tab)
  3. A/B test: 1 in 5 refreshes shows "Professional Mode" toggle β€” keep refreshing
  4. Enable Professional Mode β€” this updates cookies + server
  5. Return to quiz tab β€” UI updates! Shows 3 questions + badge
  6. But the submit handler still has proMode=false
  7. Answer all 3 questions. Submit β€” server expected pro mode, got standard.