Missing early return in set function example?

Regarding this example

import { useState } from 'react';

export default function CountLabel({ count }) {
  const [prevCount, setPrevCount] = useState(count);
  const [trend, setTrend] = useState(null);
  if (prevCount !== count) {
    setPrevCount(count);
    setTrend(count > prevCount ? 'increasing' : 'decreasing');
//    return; here?
  }
  return (
    <>
      <h1>{count}</h1>
      {trend && <p>The count is {trend}</p>}
    </>
  );
}

It seems to me that the example should include an early return statement after setTrend so React doesn't have to compute a tree that might be discarded immediately because the trend is changed from null to increasing / decreasing

first render

return (
    <>
      <h1>{count}</h1>
    </>
  );

immediate second pass

return (
    <>
      <h1>{count}</h1>
      <p>The count is increasing</p>
    </>
  );

開啟連結的 useState 文件範例，並將其目前的行為與 setTrend 之後提議的提前返回進行比較。在決定範例是否需要修訂之前，檢查周圍的說明和範例輸出；當範例及其說明準確反映約定的渲染行為時，即表示完成。