Bug You cannot load a scene from the OnUnloadEventCompleted callback.

From the OnUnloadEventComplete callback if you load a new scene the scene will not load. You must wait a frame before loading the new scene.

Code (CSharp):

1. private void SceneManager_OnUnloadEventCompleted(string sceneName, LoadSceneMode loadSceneMode, List<ulong> clientsCompleted, List<ulong> clientsTimedOut)
2.         {
3.             if (IsServer)
4.             {
5.                // this will NOT work
6. NetworkManager.Singleton.SceneManager.LoadScene(m_ActiveEncounter, LoadSceneMode.Additive);
7.  
8.                 // it will work if you wait a frame.
9.                 StartCoroutine(OnUnloadEventCompleted());
10.             }
11.         }
12.  
13. private IEnumerator OnUnloadEventCompleted()
14.         {
15.             yield return 0;
16.             NetworkManager.Singleton.SceneManager.LoadScene(m_ActiveEncounter, LoadSceneMode.Additive);
17. }

 

This is also an issue I'm facing. Thanks a lot for discovering a workaround

I've created an issue on the GitHub - https://github.com/Unity-Technologies/com.unity.netcode.gameobjects/issues/1942