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.
callbackNode: *,
  
  callbackExpirationTime: ExpirationTime,
  
  callbackPriority: ReactPriorityLevel,
  
  firstPendingTime: ExpirationTime,
  
  firstSuspendedTime: ExpirationTime,
  
  lastSuspendedTime: ExpirationTime,
  
  nextKnownPendingLevel: ExpirationTime,
  
  
  lastPingedTime: ExpirationTime,
  lastExpiredTime: ExpirationTime,
  
  
  mutableSourcePendingUpdateTime: ExpirationTime,
|};
type ProfilingOnlyFiberRootProperties = {|
  interactionThreadID: number,
  memoizedInteractions: Set<Interaction>,
  pendingInteractionMap: PendingInteractionMap,
|};
type SuspenseCallbackOnlyFiberRootProperties = {|
  hydrationCallbacks: null | SuspenseHydrationCallbacks,
|};