If you want to access a state prop inside of setTimeout, use

function App() {
  
  const [count, setCount] = useState(0);
  const countRef = useRef(count);
  countRef.current = count;

  const getCountTimeout = () => {
    setTimeout(() => {
      setTimeoutCount(countRef.current);
    }, 2000);
  };
  
  return (
    ...
  )
  
}

Thanks to a discussion on Github: https://github.com/facebook/react/issues/14010