Well I did a research in typing "chicken" but I just find MCPE-8925 so I will create this ticket
I spawned 3 chicken jockeys then I spawned a villager, and the jockeys are agressive to the villager but they don't attack it. The same when using zombie pigman jockeys.
If I am in survival mode, they will chase me but will not deal any damage.
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Confirmed for 0.11.1 on iPhone 6 plus (iOS 8.3). Chicken jockeys do not attack players or entities, though they are capable of chasing them.