To reproduce:

1. Create new project.
2. Create and save new scene.
3. Export the scene into a package.
4. Rename the scene in project explorer.
5. Export it again into different package.
6. Delete all the scenes in the project.
7. Import both packages in the same order they were created.

Expected result: Both scenes are imported.
Actual result: Unity thinks that second scene is the same as the first one, even it got renamed (probably has same GUID). Also shows wrong name in package import window.

Reproduced on: 5.6.0b7