getting warning on button click stick mode(findDOMNode is deprecated in StrictMode) issue in react js?

I am getting below warning on button click

findDOMNode is deprecated in StrictMode. findDOMNode was passed an instance of Transition which is inside StrictMode. Instead, add a ref directly to the element you want to reference. Learn more ab

here is my code https://codesandbox.io/s/zen-cartwright-v5zqy

<button
        onClick={() => {
          messageRef.current && messageRef.current.handleClick();
        }}
      >

HTML

const messageRef = useRef();

<MessageModal
        ref={messageRef}
        message={message.message}
        severity={message.severity}
      />