Reproduction steps:
1. Open attached project.
2. Open "test_scene_a".
3. Notice that lighting is dark(picture attached).
4. Go to "Window > Lighting > Scene" and click "Build"
5. Notice that lighting gets brighter(picture attached).
6. Open this project on another machine.
7. Repeat steps 3-5.

Workaround:
* Export this scene to another project. Lighting stays consistent when machines are swapped.

Notes:
- Directional Specular mode will be “deprecated“ in 5.5.0f1 and will be removed entirely in 5.6. Currently, no fixes are planned for this feature.