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Incorrect Behavior in useState Hook

Description:
When using the useState hook with an initial value of an object, the state is not updating correctly when updating nested properties of that object.

Steps to Reproduce:

Create a React component.
Initialize state using useState hook with an object.
Update nested property of the state object using setState.
jsx
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import React, { useState } from 'react';

const ExampleComponent = () => {
  const [state, setState] = useState({ 
    nested: { value: 0 }
  });

const incrementNestedValue = () => {
    setState(prevState => ({
      ...prevState,
      nested: {
        ...prevState.nested,
        value: prevState.nested.value + 1
      }
    }));
  };

return (
    <div>
      <p>Nested Value: {state.nested.value}</p>
      <button onClick={incrementNestedValue}>Increment Nested Value</button>
    </div>
  );
};

export default ExampleComponent;
Expected Behavior:
The nested value should increment each time the button is clicked.

Actual Behavior:
The nested value is not updating, it remains at 0 regardless of how many times the button is clicked.

Additional Information:
This issue occurs when updating nested properties of an object using useState. It seems that the shallow merge performed by setState is not updating the nested property correctly.

Environment:

React version: 17.0.2
Browser: Chrome 99.0.9999.99
Operating System: Windows 10

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langbase/bug-report-summarizer
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JSON mode

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Stream mode

Store messages

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{{bug}}

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Readme

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