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_yieldValue('Foo');
      return (
        <Suspense fallback={<Text text="Loading..." />}>
          <AsyncText text="A" ms={5000} />
          <Suspense fallback={<Text text="Loading more..." />}>
            <AsyncText text="B" ms={10000} />
          </Suspense>
        </Suspense>
      );
    }
    ReactNoop.render(<Foo />);
    
    expect(Scheduler).toFlushAndYield([
      'Foo',
      
      'Suspend! [A]',
      
      'Suspend! [B]',
      'Loading more...',