Top blockface becomes unlit when a custom blockmodel extends to far vertically outside of the originating subchunck

Steps to repeat:

1. Have a block model with cubes that extend vertically or are placed more than 8 units above the origin block
2. Place the block on the top border of the subchunk

Expected outcome:

1. All faces of the block are lit normally

Actual outcome:

1. Top face of block model that is more than 8 units outside of the sub chunk becomes unlit