Callback number not found for struct Steamworks.SteamInventoryResult_t

[NathanInbar]

Steps for Reproduction:

1. New 3D project with Unity Version 2022.3.25f1
2. Import Steamworks NET 20.2.0 with git url
3. Create the following script: MyScript.cs

   
   using UnityEngine;
   using Steamworks;

public class MyScript : MonoBehaviour { protected Callback m_SteamInventoryResult;

private void OnEnable()
{
    if (SteamManager.Initialized)
    {
        m_SteamInventoryResult = Callback<SteamInventoryResult_t>.Create(OnSteamInventoryResult); // this line throws exception
    }
    else
        throw new System.Exception("Steam Manager not initialized!");
}

private void Start()
{
    SteamInventory.GetAllItems(out SteamInventoryResult_t handle);
}

private void OnSteamInventoryResult(SteamInventoryResult_t p_callback)
{
    print("method pass");
    SteamInventory.DestroyResult(p_callback);
}

}

4. Change appid in project directory/steam_appid.txt
5. Create new scene
6. Add game object with SteamManager and MyScript 
7. Play the scene
8. Exception:

Exception: Callback number not found for struct Steamworks.SteamInventoryResult_t Steamworks.CallbackIdentities.GetCallbackIdentity (System.Type callbackStruct) (at ./Library/PackageCache/com.rlabrecque.steamworks.net@a3fe8091f7/Runtime/CallbackIdentity.cs:22) Steamworks.CallbackDispatcher.Register (Steamworks.Callback cb) (at ./Library/PackageCache/com.rlabrecque.steamworks.net@a3fe8091f7/Runtime/CallbackDispatcher.cs:78) Steamworks.Callback1[T].Register (Steamworks.Callback1+DispatchDelegate[T] func) (at ./Library/PackageCache/com.rlabrecque.steamworks.net@a3fe8091f7/Runtime/CallbackDispatcher.cs:272) Steamworks.Callback1[T]..ctor (Steamworks.Callback1+DispatchDelegate[T] func, System.Boolean bGameServer) (at ./Library/PackageCache/com.rlabrecque.steamworks.net@a3fe8091f7/Runtime/CallbackDispatcher.cs:240) Steamworks.Callback1[T].Create (Steamworks.Callback1+DispatchDelegate[T] func) (at ./Library/PackageCache/com.rlabrecque.steamworks.net@a3fe8091f7/Runtime/CallbackDispatcher.cs:226) MyScript.OnEnable () (at Assets/Scripts/MyScript.cs:12)

[BenLubar]

The struct you are looking for is SteamInventoryResultReady_t.

SteamInventoryResult_t is an opaque integer type.