AI aggro bug?

Not 100% sure but i notice that in custom games if ai are present on both teams then the ai will prefere to aggro on players rather than enemy ai. I have tested this multiple times and the enemy ai will all ult a player as soon as they are in range while ignoring that players allied ai. I also see that enemy ai will walk through many low hp ai allies just to get at a player. Please fix, makes only me ai customs unplayable grey screen simulators if i want to play melee champs.