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.
this.pendingInteractionMap = new Map();
  }
  if (enableSuspenseCallback) {
    this.hydrationCallbacks = null;
  }
}
export function createFiberRoot(
  containerInfo: any,
  tag: RootTag,
  hydrate: boolean,
  hydrationCallbacks: null | SuspenseHydrationCallbacks,
): FiberRoot {
  const root: FiberRoot = (new FiberRootNode(containerInfo, tag, hydrate): any);
  if (enableSuspenseCallback) {
    root.hydrationCallbacks = hydrationCallbacks;
  }
  
  
  const uninitializedFiber = createHostRootFiber(tag);
  root.current = uninitializedFiber;
  uninitializedFiber.stateNode = root;
  initializeUpdateQueue(uninitializedFiber);
  return root;
}
export function isRootSuspendedAtTime(
  root: FiberRoot,
  expirationTime: ExpirationTime,
): boolean {
  const firstSuspendedTime = root.firstSuspendedTime;
  const lastSuspendedTime = root.lastSuspendedTime;