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.
<>
        <span>A</span>
        <span>B</span>
        <span>C</span>
        <span>D</span>
        <span>E</span>
        <span>F</span>
      </>,
    );
  });
  it('only shows no initial loading state "hidden" tail insertions', async () => {
    let A = createAsyncText('A');
    let B = createAsyncText('B');
    let C = createAsyncText('C');
    function Foo() {
      return (
        <SuspenseList revealOrder="forwards" tail="hidden">
          <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>
      );
    }
    ReactNoop.render(<Foo />);