When we use a txp that have a custom 3D model there can occurs lighting bug that cause a certain side (north/west/east/south/up/down) to be visible as almost completly black if not at the collision box edge and a solid block touches that. 

Settings:
Smooth lighting: Maximum
Graphic: Fancy

Texture pack to reproduce below
Nests are rotated 180° but it still works the same way

I think that this can be related to MC-51447 but I was said to create a new ticket