OverflowException with NetworkVariable using InstantiateAndSpawn with Dedicated-Server

[joshturb]

Description

OverFlowException when instantiating a object with networkvariables on it, using InstantiateAndSpawn when host is dedicated server

Reproduce Steps

1. Make a dedicated server build
2. Have a prefab with a NetworkVariable
3. Have the server spawn the prefab using InstantiateAndSpawn
4. See error

Actual Outcome

OverflowException: Reading past the end of the buffer, Error
server spawns player but chokes on the declaration of the networkvariable
no matter what the network variable is it will not work, unless it was a scene object.

Expected Outcome

It behaves normally initializing the network variable

Environment

• OS: Windows 10
• Unity Version: 2023.2.5f1
• Netcode Version: 1.11.0

Additional Context

It was fixed by instantiating then using obj.SpawnAsPlayer(clientId) instead of InstantiateAndSpawn

Full Error:

Unity.Netcode.UnmanagedTypeSerializer1[T].Read (Unity.Netcode.FastBufferReader reader, T& value) (at ./Library/PackageCache/[email protected]/Runtime/NetworkVariable/NetworkVariableSerialization.cs:252)
Unity.Netcode.NetworkVariableSerialization1[T].Read (Unity.Netcode.FastBufferReader reader, T& value) (at ./Library/PackageCache/[email protected]/Runtime/NetworkVariable/NetworkVariableSerialization.cs:1623)
Unity.Netcode.NetworkVariable1[T].ReadField (Unity.Netcode.FastBufferReader reader) (at ./Library/PackageCache/[email protected]/Runtime/NetworkVariable/NetworkVariable.cs:260)
Unity.Netcode.NetworkBehaviour.SetNetworkVariableData (Unity.Netcode.FastBufferReader reader, System.UInt64 clientId) (at ./Library/PackageCache/[email protected]/Runtime/Core/NetworkBehaviour.cs:1123)
Unity.Netcode.NetworkObject.SetNetworkVariableData (Unity.Netcode.FastBufferReader reader, System.UInt64 clientId) (at ./Library/PackageCache/[email protected]/Runtime/Core/NetworkObject.cs:1521)
Unity.Netcode.NetworkObject.SynchronizeNetworkBehaviours[T] (Unity.Netcode.BufferSerializer1[T]& serializer, System.UInt64 targetClientId) (at ./Library/PackageCache/[email protected]/Runtime/Core/NetworkObject.cs:1794)
Unity.Netcode.NetworkObject.AddSceneObject (Unity.Netcode.NetworkObject+SceneObject& sceneObject, Unity.Netcode.FastBufferReader reader, Unity.Netcode.NetworkManager networkManager) (at ./Library/PackageCache/[email protected]/Runtime/Core/NetworkObject.cs:1943)
Unity.Netcode.CreateObjectMessage.CreateObject (Unity.Netcode.NetworkManager& networkManager, System.UInt64 senderId, System.UInt32 messageSize, Unity.Netcode.NetworkObject+SceneObject sceneObject, Unity.Netcode.FastBufferReader networkVariableData) (at ./Library/PackageCache/[email protected]/Runtime/Messaging/Messages/CreateObjectMessage.cs:54)
UnityEngine.Debug:LogException(Exception)
Unity.Netcode.CreateObjectMessage:CreateObject(NetworkManager&, UInt64, UInt32, SceneObject, FastBufferReader) (at ./Library/PackageCache/[email protected]/Runtime/Messaging/Messages/CreateObjectMessage.cs:59)
Unity.Netcode.CreateObjectMessage:Handle(NetworkContext&) (at ./Library/PackageCache/[email protected]/Runtime/Messaging/Messages/CreateObjectMessage.cs:45)
Unity.Netcode.NetworkMessageManager:ReceiveMessage(FastBufferReader, NetworkContext&, NetworkMessageManager) (at ./Library/PackageCache/[email protected]/Runtime/Messaging/NetworkMessageManager.cs:582)
Unity.Netcode.NetworkMessageManager:HandleMessage(NetworkMessageHeader&, FastBufferReader, UInt64, Single, Int32) (at ./Library/PackageCache/[email protected]/Runtime/Messaging/NetworkMessageManager.cs:446)
Unity.Netcode.NetworkMessageManager:ProcessIncomingMessageQueue() (at ./Library/PackageCache/[email protected]/Runtime/Messaging/NetworkMessageManager.cs:472)
Unity.Netcode.NetworkManager:NetworkUpdate(NetworkUpdateStage) (at ./Library/PackageCache/[email protected]/Runtime/Core/NetworkManager.cs:49)
Unity.Netcode.NetworkUpdateLoop:RunNetworkUpdateStage(NetworkUpdateStage) (at ./Library/PackageCache/[email protected]/Runtime/Core/NetworkUpdateLoop.cs:192)
Unity.Netcode.<>c:<CreateLoopSystem>b__0_0() (at ./Library/PackageCache/[email protected]/Runtime/Core/NetworkUpdateLoop.cs:215)```

[NoelStephensUnity]

Hi @joshturb
To better understand this issue, could you provide:

• The NetworkBehaviour that contains the NetworkVariable property (or an example of that class/script)
• The NetworkBehaviour or MonoBehaviour that was invoking NetworkObject.InstantiateAndSpawn or NetworkSpawnManager.InstantiateAndSpawn (or a culled version of that class/script so I can understand at what point this is being invoked).

The above information will help me replicate the issue on my end.