How to reproduce:
1. Download the user-submitted package
2. Create a new Unity project
3. Create a new Scene with a default name in the root Assets folder(Assets/New Scene.unityscene)
4. Import the package and overwrite the scene
5. Reload the New Scene

Expected result: 'New Scene' should contain 3 simple GameObjects, a Main Camera and a Directional Light
Actual result: 'New Scene' is empty, any saved changes to this scene will be lost upon reloading it, deleting and creating a scene with the same name will still present a broken scene

Reproducible with: 2019.3.0a8, 2019.4.10f1, 2020.1.6f1, 2020.2.0b3
Not reproducible with: 2018.4.27f1, 2019.3.0a7

Notes:
Restarting Unity prevents the saved changes from disappearing