When following a player with food, animal mobs are unable to jump up blocks.

I expected to be able to lead animal mobs up hills.

The mobs were actually only able to go up hills when pushed by other mobs.

Steps to Reproduce:
1. Find a cow, pig, chicken, or sheep
2. Get the appropriate food item to lead them
3. Attempt to lead them up a one block slope, they will be unable to do so unless pushed by another mob as they jump.