The south-east corner of a 9x9 grid of rice paddies is not being properly irrigated. Please see the referenced image.

So, this is an interesting problem. It is all about the math. The max field range is 4, meaning that there has to be a FuildBlock "water" within four blocks. The iterator uses the following range to find the fluid block:

x-4, y0, z-4 and x+4, y0, z+4

For some reason, in the SW corner, it doesn't think that the Water block is in range.

Going to change the way it finds the Water block.