Spawn fails randomly because AssetPathHash/PrefabId is wrong #995
Description
Unity 6000.3.2f1
4.6.18R Pro
https://discord.com/channels/424284635074134018/1034477094731784302/1457778528484462672
Description:
My game uses the following script to spawn the player:
public class ScenePlayerSpawner : NetworkBehaviour
{
[Tooltip("Prefab to spawn for the player.")]
[SerializeField]
private NetworkObject _playerPrefab;
public override void OnSpawnServer(NetworkConnection connection)
{
StartCoroutine(SpawnPlayer(connection));
}
private IEnumerator SpawnPlayer(NetworkConnection connection)
{
yield return new WaitUntil(() => IsServerStarted);
yield return new WaitUntil(connection.LoadedStartScenes);
Debug.Log($"[PlayerSpawner] Spawning object: {_playerPrefab.PrefabId} and {_playerPrefab.SpawnableCollectionId} and {_playerPrefab.AssetPathHash} and {_playerPrefab.name}");
var nob = NetworkManager.GetPooledInstantiated(_playerPrefab, transform.position, transform.rotation, true);
NetworkManager.ServerManager.Spawn(nob, connection);
Debug.Log($"[PlayerSpawner] Spawned object: {nob.PrefabId} and {nob.SpawnableCollectionId} and {nob.AssetPathHash} and {nob.name}");
}
}Somtimes, when starting as host in a build, another prefab is spawned instead of the player. This other prefab is the first prefab in DefaultPrefabObjects with PrefabId 0.
Reserializing the prefabs does not help.
I confirmed that SpawnablePrefabs.InitializePrefabRange(0); in line 308 of the NetworkManager executes.
This is a screenshot from when the debug code only contained the AssetPathHash and the issue happened.
I'm not able to reproduce the issue right now, but last time it happened it showed:
[PlayerSpawner] Spawning object: 0 and 0 and AssetPathHash of player and NetworkPlayer
[PlayerSpawner] Spawned object: 0 and 0 and AssetPathHash of some random weapon attachment that is first in DefaultPrefabObjects and name of said attachment.
Replication:
The issue is non deterministic and I found nothing that influences it, besides removing every other prefab and making the player the only network prefab.
The issue only happens in-build and seems to be tied to the build. Some builds never work, some builds always work. I tried on my PC and Mac and both are equally inconsistent. When I build over and over again without changing anything, the result remains the same. But when I change something (can be completely unrelated), the result might change.
Expectation:
I expect FishNet to spawn the correct object and assign the prefab ids correctly.
This is what the debug statements look like when it works:
