Steps to reproduce:

1. Open attached project
2. Open scene "scene01"
3. Open script "SceneObjectTest.cs"
4. Notice that it gets Scene object using GetActiveScene and prints its path. Then opens scene01 and prints path of the same Scene object again
5. In top menu, click "Scene Object Test > Test"
6. Notice that first Debug.Log prints path to scene, as expected, but the second one returns Null, meaning that properties of Scene got using GetActiveScene are lost

Bug introduced with new SceneManagement/EditorSceneManagement API.

Reproduced with: 5.3.0f4, 5.4.0a6