Css transition classNames get removed by react updates, if child has 'className' props

[icy0307]

What is the current behavior?

CSSTransition add classname to child component by dom API directly, not by react.
If react updates after CSSTransition adding class, CSSTransition's class names ,like 'enter-done', get removed by react props.

const [showClassNames, setshowClassNames] = useState(false);
<CSSTransition nodeRef={nodeRef} in={inProp} timeout={200} classNames="my-node">
        <div 
           ref={nodeRef}
           className={showClassNames? "anyClassName": ""}
           onClick={() => {setshowClassNames(true)}
         >
          {"I'll receive my-node-* classes"}
        </div>
</CSSTransition>

What is the expected behavior?

CSSTransition's class names remains , even if child component updates with class

Could you provide a CodeSandbox demo reproducing the bug?

https://codesandbox.io/s/morning-pond-xu2e9l