Distance Field Traveral system in Content Example visual accuracy degraded since UE4

Beetles no longer swarm on demo station mesh (only on the ground underneath), and beetles walks inside the head mesh more often than they did in UE4. 

1. Open Content Examples project
2. Open Advanced Niagara level
3. Observe: beetles no longer swarm on demo station mesh (only on the ground underneath), and beetles walks inside the head mesh more often than in UE4