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.
'Effect [B]',
      ]);
    } else {
      expect(Scheduler).toFlushAndYield([
        'B',
        'Destroy Layout Effect [Loading...]',
        'Destroy Effect [Loading...]',
        'Layout Effect [B]',
        'Effect [B]',
      ]);
    }
    
    ReactNoop.renderLegacySyncRoot(<App text="B2" />, () =>
      Scheduler.unstable_yieldValue('Commit root'),
    );
    expect(Scheduler).toHaveYielded([
      'A',
      'Suspend! [B2]',
      'C',
      'Loading...',
      
      
      'Layout Effect [Loading...]',
      'Commit root',
    ]);
    
    expect(Scheduler).toFlushAndYield([
      
      
      'Effect [Loading...]',