[Selfish Gene]

The primary issue with this is much the same with Wyverntouched and whatnot. What happens with Kaelensia is that they don't receive an "immunity" until 20 SAN, much like Wyverntouched don't receive an "immunity" until 50 SAN. As such, status effect still applies (Wyverntouched still benefit from poison, thus making immunity a detriment) but you simply don't receive the immunity of it all. It would most likely something Dev didn't realize while coding it in but there have been no reasons to fix it. Basically, pre-20 SAN for blind is basically a "blind resistance" and I suppose the way he coded it was more of a "100% blind resistance" rather than proper blind immunity. I realize much the same with my Corbie but didn't pay it much mind.

Edit: This should be patched though because things like Negotiate can take advantage of this.