https://codesandbox.io/s/upbeat-frost-3tt25

1. Press Suspend, see "Loading..."
2. Wait five seconds, you'll see "Happy birthday" at some point 
3. You won't see it again no matter how long you wait

Expected: you'll see it every five seconds.
return (
        <SuspenseList revealOrder="backwards">
          <Suspense fallback={<Text text="Loading A" />}>
            <A />
          </Suspense>
          <Suspense fallback={<Text text="Loading B" />}>
            <B />
          </Suspense>
          <Suspense fallback={<Text text="Loading C" />}>
            <C />
          </Suspense>
        </SuspenseList>
      );
    }
    await A.resolve();
    ReactNoop.render(<Foo />);
    expect(Scheduler).toFlushAndYield([
      'Suspend! [C]',
      'Loading C',
      'Loading B',
      'Loading A',
    ]);
    expect(ReactNoop).toMatchRenderedOutput(
      <>
        <span>Loading A</span>
        <span>Loading B</span>