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="forwards">
          <SuspenseList revealOrder="forwards" tail="hidden">
            <Suspense fallback={<Text text="Loading A" />}>
              <Text text="A" />
            </Suspense>
            {showB ? (
              <Suspense fallback={<Text text="Loading B" />}>
                <B />
              </Suspense>
            ) : null}
          </SuspenseList>
          <Suspense fallback={<Text text="Loading C" />}>
            <Text text="C" />
          </Suspense>
        </SuspenseList>
      );
    }
    ReactNoop.render(<Foo showB={false} />);
    expect(Scheduler).toFlushAndYield(['A', 'C']);
    expect(ReactNoop).toMatchRenderedOutput(
      <>
        <span>A</span>
        <span>C</span>
      </>,
    );