Thief %/s (KMS Unlimited and GMS Tempest)

Updated Phantom for Tempest, and I was informed about a new penalty from stolen skills. I tested it with Paralyze and Magic Claw since I couldn't find a Corsair, and it ended up at 77% of normal damage, i.e. my Paralyze did 160% * 0.77 (level 10 Talent), as did the damage over time. The duration of stolen buffs is 60% of the normal duration.

Is that change in the extractions? I couldn't find any info about nerfed Phantom beyond the 20% nerf in Prelude. But if this is true...goddamn it nexon.