react-scripts 4.0.1 hot reload bug ( but 3.4.3 works )

[wendux]

Describe the bug

import React, {useState} from 'react';

function Example(props) {
 return <div>{props.title}</div>
}

const ExampleNew = React.memo(Example, (prevProps, nextProps) => {
 // update here ，hot reload doesn't work unless refreshing the page in browser
 // console.log("2")
 console.log("1")
 return false
})


function App() {
 const [count, setCount] = useState(0);

 return (
 <div>
 <ExampleNew title={count}/>
 <button onClick={() => setCount(count + 1)}>
 Click me
 </button>
 </div>
 );
}

export default App;

[grancalavera]

Seems related to #10254

[mcchong]

Just upgraded to 4.0.1 from 3.something and have a bunch of weird behaviour re: hotloading. Can file a more detailed bug report when I have the time, but the page doesn't refresh on save anymore - is this a bug or a feature? Also sometimes I have to kill the tab on certain compile errors because the console get stuck spamming the errors...