I encountered this in a village with a pre-generated farm but I managed to reproduce it.
Picture below is my reproduction of this bug, and above is pre-generated farm from a village.
It's a survival game, I didn't check this in creative.
Environment
Windows 7 Ultimate Sp1
Java Version 7 Update 51
Vanilla Minecraft
The linked issue is a bit broader. Tilled soil is classed as transparent.