To reproduce:
1. Open project "766498 repro.zip"
2. Open the scene "Game"
3. Zoom out so the whole plane is visible
4. Observe that the point light only lights up one half of the plane, even though it is above the middle of the plane. (screenshot attached)

Note that this only happens when the plane has a texture. Changing the texture's import settings changes which half is lit. If the point light's range is set to a smaller value, say, 100, the problem isn't visible.