Before, you could put your pet on passive and if it got aggro (for running too close to a mobs), you could release it and the mobs would leave you alone. Now the aggro is transfered to the caster upon death of the pet(s) even though they did no dmg to said mobs.
Pretty easy to test, summon pet, put it on passive, send it to an aggro mobs, release it and the mobs will aggro the caster even if the caster is not close to his pets.
Pretty easy to test, summon pet, put it on passive, send it to an aggro mobs, release it and the mobs will aggro the caster even if the caster is not close to his pets.