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.
root.render(<App step={1} shouldSuspend={true} />);
      Scheduler.unstable_advanceTime(1000);
      expect(Scheduler).toFlushAndYieldThrough(['Sibling']);
      interrupt();
      root.render(<App step={2} shouldSuspend={true} />);
      Scheduler.unstable_advanceTime(1000);
      expect(Scheduler).toFlushAndYieldThrough(['Sibling']);
      interrupt();
      root.render(<App step={3} shouldSuspend={true} />);
      Scheduler.unstable_advanceTime(1000);
      expect(Scheduler).toFlushAndYieldThrough(['Sibling']);
      interrupt();
      root.render(<App step={4} shouldSuspend={false} />);
    });
    
    expect(Scheduler).toHaveYielded([
      'Sibling',
      'Suspend! [Step 1]',
      'Sibling',
      'Suspend! [Step 2]',
      'Sibling',
      'Suspend! [Step 3]',
      'Sibling',
      'Step 4',
    ]);
  });
  it('forces an expiration after an update times out', async () => {
    ReactNoop.render(
      <Fragment>
        <Suspense fallback={<Text text="Loading..." />} />