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>
    </>
  );

打开链接的 useState 文档示例，并将其当前行为与 setTrend 之后提议的提前返回进行比较。在决定示例是否需要修订之前，检查周围的说明和示例输出；当示例及其说明准确反映约定的渲染行为时，即表示完成。