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.
]);
        Scheduler.unstable_advanceTime(1000);
        await advanceTimers(1000);
        expect(ReactNoop.getChildren()).toEqual([
          hiddenSpan('Before... Pending: true'),
          span('Loading... Pending: false'),
        ]);
        Scheduler.unstable_advanceTime(500);
        await advanceTimers(500);
        expect(Scheduler).toHaveYielded([
          'Promise resolved [After... Pending: false]',
        ]);
        expect(Scheduler).toFlushAndYield(['After... Pending: false']);
        expect(ReactNoop.getChildren()).toEqual([
          span('After... Pending: false'),
        ]);
      },
    );
    it.experimental(
      'delays showing loading state until after busyDelayMs + busyMinDurationMs',
      async () => {
        let transition;
        function App() {
          const [show, setShow] = useState(false);
          const [startTransition, isPending] = useTransition({
            busyDelayMs: 1000,
            busyMinDurationMs: 2000,
          });
          transition = () => {
            startTransition(() => {