I have been in the tunnels and twice been killed by- an amorphous mass- as i rounded a bend and was inside agro range. Didn't get a chance to con that it sees thru SOS 2, but, being attacked twice on meeting one, does tend to say that it does.
Okay, got the nerve to go back in the tunnels, and managed to con a few of the an amorphous mass, and they did not see thru my SOS2. So something else must have broken my sneak. sigh, onward.
Okay after getting killed again, I went back to dragon Necropolis, and into the tunnels, , managed to con the mobs and verified that this one saw thru my SOS2. Either it is an error in spawn abilities and needs to be adjusted next patch, or some thing else, lol.