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.
: null | Fiber,
  ContentRow: null | Fiber,
  Mode: SuspenseListTailMode,
  EffectBeforeRendering: null | Fiber,
): void {
  let renderState: null | SuspenseListRenderState =
    workInProgress.memoizedState;
  if (renderState === null) {
    workInProgress.memoizedState = ({
      : ,
      rendering: null,
      renderingStartTime: 0,
      : ContentRow,
      : ,
      Expiration: 0,
      Mode: Mode,
      Effect: EffectBeforeRendering,
    }: SuspenseListRenderState);
  } else {
     
    renderState. = ;
    renderState.rendering = null;
    renderState.renderingStartTime = 0;
    renderState. = ContentRow;
    renderState. = ;
    renderState.Expiration = 0;
    renderState.Mode = Mode;
    renderState.Effect = EffectBeforeRendering;
  }
}