Whenever you try to pick (Default Button:scroll mouse) a farmland that haves a data value between 3 to 7 while in creative mode,it will give you a weird item that haves an id of dirt with a Data Value of 3(or depending on the data value of the farmland that you mouse scrolled.)
And this item/block has no texture.
To reproduce this bug do the following steps:
1-get a farmland that haves a data value between 3 to 7.
2-While you're in creative mode,try to pick (Default Button: scroll mouse) a farmland that haves a data value between 3 to 7.
You can also see the screenshot i put.