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" tail="hidden">
          <Suspense key="A" fallback={<Text text="Loading A" />}>
            <Text text="A" />
          </Suspense>
          <B key="B" updateList={updateList} />
        </SuspenseList>
      );
    }
    ReactNoop.render(<Foo />);
    expect(Scheduler).toFlushAndYield(['A', 'Sync B']);
    expect(ReactNoop).toMatchRenderedOutput(
      <>
        <span>A</span>
        <span>Sync B</span>
      </>,
    );
    let previousInst = setAsyncB;
    
    ReactNoop.act(() => setAsyncB(true));
    expect(Scheduler).toHaveYielded([
      'Suspend! [B]',
      'Loading B',
      
      'Loading B',
    ]);