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.
Linked issues
duplicates 1
Attachments
Comments 3

Actually you're wrong. This is clearly a case of it giving him DIRT instead of FARMLAND yet carrying over the data value. The other issue you linked to was about VALID BLOCKS (imported maps from 1.7) showing as "missing texture". That is, unchanged blocks. This one is changing the block during pickblocking, but changing it wrong.
Tokes is right, this bug is different, it's a duplicate of MC-50239 instead.
Duplicate of MC-50998 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.