Mod Pack: ATM 10
Version: 1.1.10-mc1.21.1

Set up a mob Farm with Dreadful Dirt, Fans and a Mob Masher.
The Masher is drawing Agro from all mobs causing creepers to explode, and attracting a ton of zombies to my base.

Unless this is a new feature or a config I can alter, this is the first time I've ever had this issue