Sandbox: https://codesandbox.io/s/cranky-kapitsa-op3jh

Repro: type "a" and then after a second "b"

Expected: Eventually you'll see "ab" in all fields. Pending "..." indicator goes away.

Actual: You'll keep seeing "a" in low pri field. Pending "..." indicator is stuck.
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) {