Repro: https://codesandbox.io/s/fast-water-4i4jb

Notice the flash. I'd expect `suspended` to be `true` during the high pri render.
const child = useRef(null);
          useLayoutEffect(() => {
            Scheduler.unstable_yieldValue(ReactNoop.getPendingChildrenAsJSX());
          });
          return (
            <span ref={child} hidden={false}>
              <AsyncText ms={1000} text="Hi" />
            </span>
          );
        }
        function App(props) {