Returning Projectiles Support with Poison

Returning Projectiles Support is not applying the "Projectiles from Supported Skills deal (70-61)% less Damage while Returning" line to poison damage.

I can't tell if this is a bug and I can't tell if they know about it.

"Projectile skills deal less damage" Sounds global.
"Projectiles from supported skills deal less damage" Sounds the same to me.
"... deal less projectile damage" This shouldn't lower the damage, but that's clearly not what's being stated here.

So probably a game-bug or a text-bug?