SyncType does not send changes when NetworkObject is despawned on the same tick it's spawned

[ooonush]

General Unity version: 6000.0.3 Fish-Networking version: 4.3.5

Description SyncType does not send changes to client when NetworkObject is despawned on the same tick it's spawned.

Replication

1. Place the NetworkObject with the TestSpawner component on the scene:

   public class TestSpawner : NetworkBehaviour
   {
   [SerializeField] private TestNetworkBehaviour _prefab;
   
   public override void OnStartClient()
   {
       if (IsHostInitialized)
       {
           NetworkObject no = NetworkManager.GetPooledInstantiated(_prefab.NetworkObject, true);
           Spawn(no);
           // and despawn this:
           Despawn(no);
       }
   }
   }

2. Create a NetworkObject prefab with a TestNetworkBehaviour component:

   public class TestNetworkBehaviour : NetworkBehaviour
   {
   private readonly SyncVar<int> _syncVar = new();
   
   public override void OnStartServer()
   {
       Debug.Log("OnStartServer");
       _syncVar.Value = 10;
   }
   
   public override void OnStartClient()
   {
       Debug.Log("OnStartClient " + _syncVar.Value);
   }
   }

3. Start server
4. Start other clients
5. Start client-host

Expected behavior

On client started SyncType should be 10, not 0. Since OnStartClient is being called, the SyncTypes should also be synchronized. This is a problem for me when the projectile is despawned on the same tick it`s spawned.

Screenshots

[ooonush]

What works for me is this despawn method:

private uint _tickSpawned;
private NetworkObject _no;

public override void OnStartClient()
{
    if (IsHostInitialized)
    {
        _no = NetworkManager.GetPooledInstantiated(_prefab.NetworkObject, true);
        Spawn(_no);
        _tickSpawned = TimeManager.Tick;
    }
}

private void TimeManager_OnTick()
{
    if (_no && TimeManager.Tick > _tickSpawned + 2)
    {
        Despawn(_no);
        _no = null;
    }
}

That is, I have to do a check for TimeManager.Tick > _tickSpawned + 2.

[ooonush]

For clients-only the check TimeManager.Tick > _tickSpawned works. But on the client-host I have to check TimeManager.Tick > _tickSpawned + 2, which is not very elegant.

[FirstGearGames]

I'm fairly certain your desired setup should work without any changes. There's even code specific to sending pending SyncType data through on despawn for this exact scenario.

I'll make this is a bug today and take a look, most likely something small.

On Thu, Jun 6, 2024, 5:07 AM Alven @.***> wrote:

For clients-only the check TimeManager.Tick > _tickSpawned works. But on the client-host I have to check TimeManager.Tick > _tickSpawned + 2, which is not very elegant.

— Reply to this email directly, view it on GitHub https://github.com/FirstGearGames/FishNet/issues/692#issuecomment-2151785262, or unsubscribe https://github.com/notifications/unsubscribe-auth/AGPJC3RIGMIPJTF4KJN6QVTZGARGNAVCNFSM6AAAAABI4HYCVOVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDCNJRG44DKMRWGI . You are receiving this because you are subscribed to this thread.Message ID: @.***>

[FirstGearGames]

Do not have time to get this into 4.3.6 but making it high priority for 4.3.7