Well, I dont have a clue how this anti-bs working so i can give you hints and can create the anti anti-bs :P . But i'll give you a generally example.
When a mob spawning in the world the player cannot target it until some milliseconds (if not a second) passed but the bot can ignore this and target it just when the mob spawning.
So if we say its a second, you can add a check in target reqest if the target (monster) is spawned and this second didn't passed and ofc the character sucessfully target it... bot caught :P
p.s ofc there is an option in bots for delay in targets but i just gave you an example :P