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.
await advanceTimers(1000);
    expect(Scheduler).toHaveYielded(['Promise resolved [Async]']);
    expect(Scheduler).toFlushAndYield(['Async']);
    expect(ReactNoop.getChildren()).toEqual([span('Async'), span('Sync')]);
  });
  it('resolves successfully even if fallback render is pending', async () => {
    ReactNoop.render(
      <>
        <Suspense fallback={<Text text="Loading..." />} />
      </>,
    );
    expect(Scheduler).toFlushAndYield([]);
    expect(ReactNoop.getChildren()).toEqual([]);
    ReactNoop.render(
      <>
        <Suspense fallback={<Text text="Loading..." />}>
          <AsyncText text="Async" ms={3000} />
        </Suspense>
      </>,
    );
    expect(ReactNoop.flushNextYield()).toEqual(['Suspend! [Async]']);
    await advanceTimers(1500);
    expect(Scheduler).toHaveYielded([]);
    expect(ReactNoop.getChildren()).toEqual([]);
    
    await advanceTimers(2000);
    expect(Scheduler).toHaveYielded(['Promise resolved [Async]']);
    expect(Scheduler).toFlushAndYield([