ToME: the Tales of Maj'Eyal

Skin of Many doesn't boost Stealth category. Attached screenshot shows how item looks while equipped.
It's not just a visual bug as the category remains 1.30.

I am very sad. It dropped on my stealth rogue run and it doesn't work. Could it be fixed in the savegame or is it not possible?
I don't run any addons beside Vault, Stone Warden and Ashes of Urh'rok

It isn't supposed to.
It has a stealth penalty for non undead characters.

Oh crap, my bad!
I played this game for many years and I always thought it increases Stealth. Didn't even think about checking wiki for it. Thread to be removed I guess, sorry for false report