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.
ReactNoop.expire(4999);
    expect(Scheduler).toFlushWithoutYielding();
    expect(ReactNoop.getChildren()).toEqual([span('S')]);
    
    React.unstable_withSuspenseConfig(
      () => ReactNoop.render(<App text="B" />),
      {
        timeoutMs: 10000,
      },
    );
    
    expect(Scheduler).toFlushAndYield(['Suspend! [B]', 'Loading...']);
    expect(ReactNoop.getChildren()).toEqual([span('S')]);
    
    
    ReactNoop.render(<App text="C" />);
    expect(Scheduler).toFlushAndYield(['C']);
    expect(ReactNoop.getChildren()).toEqual([span('C')]);
    await advanceTimers(10000);
    
    expect(Scheduler).toHaveYielded([
      'Promise resolved [A]',
      'Promise resolved [B]',
    ]);
    
    expect(Scheduler).toFlushWithoutYielding();
    expect(ReactNoop.getChildren()).toEqual([span('C')]);
  });
  it('flushes all expired updates in a single batch', async () => {
    class Foo extends React.Component {