Attacking Each Other

I was just playing around with the new mobs, and I spawned in a bunch of pillagers, and an illager beast, then I spawned in a villager.

What I expected to happen was...:
The pillagers would all go for the villager like zombies.

What actually happened was...:
They killed the villager, but they were killing each other in the process, and crossbow arrows were hitting other pillagers, and the other pillagers did nothing.

Steps to Reproduce:
1. Spawn in some pillagers.
2. Spawn in a regular villager.
3. Let the magic happen.