How to reproduce:

1. Open a new project
2. Open Lighting window and disable automatic Baking
3. Create some Primitives in the scene
4. Create a Material with Metallic and Smoothness set to 1
5. Attach material to any primitive
6. Add a Reflection probe to the scene
- Make sure the primitive with the shiny material is within the reflection probe area
7. Set all gameobjects to be Static
8. Select the Reflection probe and try to bake it
- Note that an error is thrown in the console:
-- Couldn't resolve scene path, was scene not saved?
- This is inconsistent with what happens when trying to bake the lightmaps from the lighting window, where a message box appears asking if the user would like to save the scene
- Reproduced in Version 5.4.0b2 (d749f9c32f45), Version 5.3.1p2 (49544457ab1d), Version 5.2.4f1 (98095704e6fe)