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Spider and chicken jockeys only spawn the additional mob. This means spider jockeys will only spawn the skeleton and chicken jockeys only the chicken respectively set the IsChickenJockey tag of a nearby chicken to true without a zombie spawning on it.
- Create a Superflat world with the following preset to only allow spiders to spawn
- Set the time to night
- Use the following command to get to a nearby skeleton spawned as a spider jockey
→ You will see that the skeleton is not riding a spider
Based on 1.11.2 decompiled using MCP 9.35 rc1
It looks like the method net.minecraft.world.World.checkNoEntityCollision(AxisAlignedBB, Entity) is not working correctly and counts entities riding the same entity as colliding while it should ignore them. See also net.minecraft.world.World.getCollisionBoxes(Entity, AxisAlignedBB).