User blog comment:Scooter8pie/Transparency Bug/@comment-4583259-20111108165227

This photo shows a "transparency boundary" from a higher vantage point:

The same view by day:

Along the "boundary" you can also see a sharp vertical boundary in elevation: two "hills" seem to have been sliced in two, and the slice continues "underwater".

Also, in the distance a "superblock" edge can be seen exactly 16 blocks to the right of the boundary, and another edge 32 blocks to the left.

In Minecraft the chunks are 16x16x128 (look for "16*16*128" in a footnote on ) and I have elsewhere verified that the height and depth limits in lunacraft are both 63. Probably the programmers of Mooncraft decided to use the same chunk size.