This bug only occurs when there is an occlusion culling data locally stored in the project.

How to repro:
1. Open attached project "autoBake.zip"
2. Open scene autoBake
3. Make sure that Generate Lighting is set to Auto Generate
4. Make sure that Directional Light -> Transform -> Rotation coordinates are: x=19.75 y=27.2 z=*
5. Notice that Sphere -> Static=false (Shouldn't even be baked)
6. Examine the Sphere "problem.png"

Note: Everything is fine when Generate Lighting manually
Note: Directional Light -> Rotation z coordinate is irrelevant
Note: Directional Light -> Rotation coordinates can be tweaked +- 0.25 on the attached project. The margin of error is larger in other projects
Note: The user who reported the bug seemed to have it the opposite: For the user, auto baking worked fine, while manual baking broke the materials