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.
const firstPendingTime = root.firstPendingTime;
  if (expirationTime > firstPendingTime) {
    root.firstPendingTime = expirationTime;
  }
  
  
  const firstSuspendedTime = root.firstSuspendedTime;
  if (firstSuspendedTime !== NoWork) {
    if (expirationTime >= firstSuspendedTime) {
      
      root.firstSuspendedTime = root.lastSuspendedTime = root.nextKnownPendingLevel = NoWork;
    } else if (expirationTime >= root.lastSuspendedTime) {
      root.lastSuspendedTime = expirationTime + 1;
    }
    
    
    if (expirationTime > root.nextKnownPendingLevel) {
      root.nextKnownPendingLevel = expirationTime;
    }
  }
}
export function markRootFinishedAtTime(
  root: FiberRoot,
  finishedExpirationTime: ExpirationTime,
  remainingExpirationTime: ExpirationTime,
): void {
  
  root.firstPendingTime = remainingExpirationTime;