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...