bug w/Mandaha wearing Bone Armor?
 

Things I have seen in my recent game playing Lanka with Mandahas who I have equipped with Bone Armor:

1. Soul vortex effect doesn't always display graphically at start of battle and sometimes doesn't seem to be actually working; I have seen it start appearing after several rounds in some battles, but sometimes it never appears; and

2. Same for sleep/fatigue aura: sometimes it displays at start of battle, sometimes not, sometimes it appears later, sometimes it never appears--it doesn't seem to be working when it doesn't appear, but it's hard to tell.

Has anyone noticed similar?

I don't have Soul Vortex researched yet.

I have noticed both of these.
 

Try making your first order hold or cast and see if it makes a difference for you.