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.
'A nested %s was passed to row #%s in <SuspenseList />. Wrap it in ' +
          'an additional SuspenseList to configure its revealOrder: ' +
          '<SuspenseList revealOrder=...> ... ' +
          '<SuspenseList revealOrder=...>{%s}</SuspenseList> ... ' +
          '</SuspenseList>',
        type,
        index,
        type,
      );
      return false;
    }
  }
  return true;
}
function validateSuspenseListChildren(
  children: mixed,
  revealOrder: SuspenseListRevealOrder,
) {
  if (__DEV__) {
    if (
      (revealOrder === 'forwards' || revealOrder === 'backwards') &&
      children !== undefined &&
      children !== null &&
      children !== false
    ) {
      if (Array.isArray(children)) {
        for (let i = 0; i < length; i++) {
          if (!validateSuspenseListNestedChild(children[i], i)) {
            return;
          }