The lighting generated for terrain looks to be incorrect and has crashed for me once.

Steps to reproduce
- Create a terrain in the heirarcy.
- Create two more terrain planes as children.
- Move the terrains so one of them casts a shadow over the other two peices (Sort of triangle layout _-_ )
- Generate the lighting.
- Move the top terrain so that it will cast a shadow over the other terrain planes.
Notice issue >> The lighting is incorrect. Zooming in and out causes the shadows to change. Inititally this was crash on my system.

IMAGES ATTACHED
VIDEO ATTACHED: Lighting