A large Scorpion in Field of bone does not aggro
 

A large scorpion and a giant scorpion in the field of bone scowls at you ready to attack and does not aggro.

I think he is saying that large+ scorpions in the FoB are supposed to con KoS but not actually be KoS. I remember this also.

For some reason, it was like this on Live, too. It's the same thing with crocodiles in Oasis of Marr.