In snapshot 12w50b, mobs can't jump or fall 1 block, they will start spinning.
Steps to Reproduce:
1. Spawn a sombie
2. Attack it so it will follow you
3. Put blocks in its direction, you will see he will start spinning.
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Duplicate of MC-4644 , please use the search function to see if your bug has already been submitted. Currently over 35% of tickets are being closed as duplicate.