This may be an issue with /clone and /fill or it could just be a general issue...
As seen in these images: http://imgur.com/a/0PoT1 the sky light level is not always changed by blocks above the player.
This may be an issue with /clone and /fill or it could just be a general issue...
As seen in these images: http://imgur.com/a/0PoT1 the sky light level is not always changed by blocks above the player.
build the 'filled' area by hand; see if it still happens.