Pigs not responding to wheat or going into 'love mode' (Minecraft 1.4.2pre).

Pig's are not attracted to wheat and when wheat is used on them, nothing happens (the wheat is not lost either). Sheep and cows still respond normally.

What I expected to happen was...:
I thought pigs would follow me when I held wheat, and go into 'love mode' when I used the wheat on them.

What actually happened was...:
Pigs were totally unresponsive to wheat - they did not follow the holder or go into 'love mode' when the wheat was used on them.

Steps to Reproduce:
1. Hold any amount of wheat.
2. Approach a pig(s).
3. Use the wheat on the pig(s).