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>Loading C</span>
      </>,
    );
    
    expect(Scheduler).toFlushAndYield(['D']);
    expect(ReactNoop).toMatchRenderedOutput(
      <>
        <span>A</span>
        <span>B</span>
        <span>C</span>
        <span>D</span>
      </>,
    );
  });
  it('adding to the middle does not collapse insertions (forwards)', async () => {
    let A = createAsyncText('A');
    let B = createAsyncText('B');
    let C = createAsyncText('C');
    let D = createAsyncText('D');
    let E = createAsyncText('E');
    let F = createAsyncText('F');
    function Foo({items}) {
      return (
        <SuspenseList revealOrder="forwards" tail="collapsed">
          {items.map(([key, Component]) => (
            <Suspense key={key} fallback={<Text text={'Loading ' + key} />}>
              <Component />
            </Suspense>