Reproduction steps:

1. Open the project occlusion1 on version 5.5.0b2
2. Open the project occlusion2 on version 5.5.0b3 or newer
3. Bake occlusion on both projects if there is no occlusion data
4. Select Camera in both objects
5. Check Visualize option in scene view of both projects
6. Observe results

Expected: same view
Actual: on newer version, not all of the needed objects are culled

Not reproduced on: 5.5.0b2
Reproduced on: 5.5.0b3, 5.6.0b9, 5.6.0f3, 2017.1.0a6
Regression introduced on: 5.5.0b3

By design: In Unity 5.5 and above, when a renderer is part of a LOD group, we only consider in the bake data LOD0. User has it's LOD0 occluder settings different from the one set for other LOD levels. he should update his scene in order to propertly flag LOD0 renderers.