I've noticed this... but didn't pay attention. While both pets and sidekicks can pass through players and each other they have this habit of moving away while trying to attack. This leads to a lot of lost combat time as they scramble around moving players. During boss fights with alot of melee they will get 'shoved' in front of the AoEs of the boss which kills them instantly no matter how much resistance they have.
Can you make it so they have no collision with players at all? Collosion with enemies is fine and good. I still remember watching pets going inside of bosses and dying a few years back.
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