When I upgraded Bone Shields on my Corruptor to level 5 I got 6 flying around skull effects but it seems they don't regenerate well. Ability description says every 5 turns (for maxed out) 1 piece will regenerate so from 0 to max it should take 30 turns. In my case I don't know why but this shield regenerates after about 140 turns. I tested this also on Reaver and it happens again. Is it bug? Or is it working as intended but BS's description mislead?