When calling unmountComponentAtNode(document.getElementById('react-root')), it returns false.

This would normally happen because I'm trying to unmount something that's not a React node, but that's not the case.

I'm using unstable_createRoot. If I use render instead, it works fine.

React version: 0.0.0-experimental-79740da4c

Steps To Reproduce

1. Render component with unstable_createRoot.
2. Try to unmount the app with unmountComponentAtNode.

Link to code example: https://codesandbox.io/s/epic-leftpad-ih6ts?file=/src/index.js

The current behavior

Doesn't unmount the root React component.

The expected behavior

Should unmount the root React component.