Using network time to create a synced event

Hello,
right now I am trying to create a syncronized event using a script from the documentation. It is the example 2 from this document
https://docs-multiplayer.unity3d.com/netcode/current/advanced-topics/networktime-ticks/index.html

Herethe code:

Code (CSharp):

1. using System.Collections;
2. using Unity.Netcode;
3. using UnityEngine;
4. using UnityEngine.Assertions;
5.  
6. public class SyncedEventExample : NetworkBehaviour
7. {
8.     public GameObject ParticleEffect;
9.  
10.     // Called by the client to create a synced particle event at its own position.
11.     public void ClientCreateSyncedEffect()
12.     {
13.         Assert.IsTrue(IsOwner);
14.         var time = NetworkManager.LocalTime.Time;
15.         CreateSyncedEffectServerRpc(time);
16.         StartCoroutine(WaitAndSpawnSyncedEffect(0)); // Create the effect immediately locally.
17.     }
18.  
19.     private IEnumerator WaitAndSpawnSyncedEffect(float timeToWait)
20.     {
21.         // Note sometimes the timeToWait will be negative on the server or the receiving clients if a message got delayed by the network for a long time. This usually happens only in rare cases. Custom logic could be implemented to deal with that scenario.
22.         if (timeToWait > 0)
23.         {
24.             yield return new WaitForSeconds(timeToWait);
25.         }
26.  
27.         Instantiate(ParticleEffect, transform.position, Quaternion.identity);
28.     }
29.  
30.     [ServerRpc]
31.     private void CreateSyncedEffectServerRpc(double time)
32.     {
33.         CreateSyncedEffectClientRpc(time); // Call a client RPC to also create the effect on each client.
34.         var timeToWait = time - NetworkManager.ServerTime.Time;
35.         StartCoroutine(WaitAndSpawnSyncedEffect((float)timeToWait)); // Create the effect on the server but wait for the right time.
36.     }
37.  
38.     [ClientRpc]
39.     private void CreateSyncedEffectClientRpc(double time)
40.     {
41.         // The owner already created the effect so skip them.
42.         if (IsOwner == false)
43.         {
44.             var timeToWait = time - NetworkManager.ServerTime.Time;
45.             StartCoroutine(WaitAndSpawnSyncedEffect((float)timeToWait)); // Create the effect on the client but wait for the right time.
46.         }
47.     }
48. }

The problem is, if I run the code on the client, then nothing happens. If I run the code on the host, I use p2p, then the event happens 2x on the host and 1x on the client.
Maybe the comments in the code are also misleading. What am I doing wrong?

 

I figuered, that the example code on the unity documentation must be wrong.
This is my code now:

Code (CSharp):

1. using System.Collections;
2. using Unity.Netcode;
3. using UnityEngine;
4. using UnityEngine.Assertions;
5. using UnityEngine.Events;
6.  
7. public class SyncedGameStart : NetworkBehaviour
8. {
9.     public UnityEvent GameStart;
10.  
11.     // Called by the client to create a synced event at its own position.
12.     public void ClientCreateSyncedEvent()
13.     {
14.         if (IsHost)
15.         {
16.             return;
17.         }
18.         var time = NetworkManager.LocalTime.Time;
19.         CreateSyncedEventServerRpc(time);
20.         StartCoroutine(WaitAndSpawnSyncedEvent(0));
21.         // Create the event immediately locally.
22.         Debug.Log("Client created synced event");
23.     }
24.  
25.     private IEnumerator WaitAndSpawnSyncedEvent(float timeToWait)
26.     {
27.         // Note sometimes the timeToWait will be negative on the server or the receiving clients if a message got delayed by the network for a long time. This usually happens only in rare cases. Custom logic could be implemented to deal with that scenario.
28.         Debug.Log("Time to wait is: " + timeToWait);
29.  
30.         if (timeToWait > 0)
31.         {
32.             yield return new WaitForSeconds(timeToWait);
33.         }
34.  
35.         Debug.Log("Invoke GameStartNow: " + System.DateTime.Now.ToString() +":"+ System.DateTime.Now.Millisecond.ToString());
36.         GameStart?.Invoke();
37.     }
38.  
39.     [ServerRpc(RequireOwnership = false)]
40.     private void CreateSyncedEventServerRpc(double time)
41.     {
42.         CreateSyncedEventClientRpc(time);
43.         // Call a client RPC to also create the event on each client.
44.         var timeToWait = time - NetworkManager.ServerTime.Time;
45.         StartCoroutine(WaitAndSpawnSyncedEvent((float)timeToWait)); // Create the event on the server but wait for the right time.
46.     }
47.  
48.     [ClientRpc]
49.     private void CreateSyncedEventClientRpc(double time)
50.     {
51.         // The owner already created the event so skip them.
52.         if (IsHost)
53.         {
54.             return;
55.         }
56.         var timeToWait = time - NetworkManager.ServerTime.Time;
57.         StartCoroutine(WaitAndSpawnSyncedEvent((float)timeToWait)); // Create the event on the client but wait for the right time.
58.     }
59. }

I now have the problem, that when I add a little delay to the network, the timeToWait is always a negative number and the event is triggered right away.