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Question

so-79554604

so-79554604

so-79554604

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DESCRIBESProblem

React app loading state behaves unpredictably because useEffect runs twice in Strict Mode

DESCRIBESProblem

`Header` and `Body` are sibling components — `Header` updates its state.

DESCRIBESProblem

I also don't understand why the timing of the API fetch and the state update in `Header` affects this behavior. — the timing of the API fetch and the state update in `Header`.

DESCRIBESProblem

If I remove `Header`, `Body` renders only once. — If I increase the `setTimeout` duration (e.g., from `250ms` to `1000ms`), `Body` also renders only once. Tension: The issue occurs specifically when the `setTimeout` duration is close to the API fetch duration.

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