Reaper's mask and Selective channeling

[Salmonellius]

Hello,

I set a cleric NPC whith Cha 13 and the feat Selective channeling.

When I give her a skinsaw mask, it's ok. The wearer takes 1 point of Charisma damage, and - attribute damage being not the same as drain - the cleric keeps Charisma 13.

But when she dons a reaper's mask, which inflicts the same Charisma damage as the skinsaw mask, HL lows Charisma to 12 ... and highlights Selective channeling in red, as if it was Charisma drain !

It seems it's a bug ...