Prefabs with NetworkingManager component automatically add any open scene to list of networked scenes

[roglew]

Describe the bug Prefabs with a NetworkingManager component automatically add any open scene to its list of networked scenes. This is because the NetworkingManager checks if the open scene is in its list of scene names in its OnValidate function. Prefabs will have their OnValidate function called regardless of if there is an instance of it in the scene.

To Reproduce

• Create a new Unity project, set up MLAPI, etc
• In the Assets folder, right click then select "Create new" -> "Prefab"
• Open the prefab by double clicking it
• Add a "NetworkingManager" component to the prefab
• Return to the scene view
• Open the prefab again
• Note that the open scene was added to the prefab

Expected behavior Prefabs with a NetworkingManager component should not automatically add open scenes to its list of registered scenes. Prefab instances placed in a scene may behave this way but the prefabs themselves should not.

Screenshots If applicable, add screenshots to help explain your problem.

Environment (please complete the following information):

• OS: Windows 10
• Unity Version: 2020.2.1f1
• MLAPI Version: v12.1.7

Additional context At the moment this can be worked around by making a sublcass of the NetworkingManager with an empty OnValidate function and using that instead. Obviously this prevents any other validations it would do as well:

using MLAPI;

public class NetworkingManagerNoValidate : NetworkingManager
{
    void OnValidate() {}
}

[will-mearns]

Adding to Bug backlog for triage - MTTSDK-22

[NoelStephensUnity]

Hi @roglew, This should no longer be an issue in Netcode for GameObjects v1.0.0-pre.x versions. Upgrade to the most recent version should resolve this issue for you.