When a scene object is networked they may behave differently.
A networked scene object will be disabled when a scene loads, and will not activate until the client or server is started. For clients specifically networked scene objects will only activate when the server is sure the client has loaded the scene; this is done automatically through the Fish-Networking scene manager.
Our SceneManager allows instantiated networked objects to be moved between scenes, but networked scene objects may not. Unity cannot know a scene objects details without the scene being loaded first, so trying to spawn a scene object without the client having the scene loaded would result in errors.
Due to the movement restrictions just mentioned, networked scene objects may not be marked DontDestroyOnLoad, nor can the NetworkObject.IsGlobal feature be used. Both of these would place the scene object in a new scene, causing errors.
When a networked scene object is despawned it is always disabled, rather than destroyed. This is so you may spawn it at a later time. Manually destroying a scene object on the server is possible and would simply result in it never being spawned on clients.
