Resolved world.Dispose destroys Gameobjects MainScene

It appears that the first Entities world that is created associates itself with the Unity MainScene, and when Dispose() is called on this world the MainScene is destroyed.

This didn't previously happen. Is this expected behaviour?

I can stop this by commenting out the following lines in com.Unity.Entities@0.17.0-preview.41/Unity.Scenes/GameObjectSceneManager.cs

154: if(unityScene.IsValid())

155:                SceneManager.UnloadSceneAsync(unityScene);

(Case 1327908)

 

When working with multworlds adding the define UNITY_DISABLE_AUTOMATIC_SYSTEM_BOOTSTRAP will give you the behavior you want.

 

Thanks! I must have removed this define myself at some point... Adding it back in has resolved my problem.