Reproduction steps:
1. Download and import "Living Room Pack" from the asset store
2. open - "room_02_lounge_day" or "room_02_lounge_night" scene
3. Notice that both in Scene and in Game view everything looks fine (lightmaps are baked in an external tool like VRay)
4. Play the scene
5. Scene becomes white and black (attached a screenshot).

Please note the user script for assigning the lightmaps.