first of all i thought, why on earth did he thought this mace gives survival bonus ?
I only remember it like it is at the Wiki.
A look closer The_Unintelligible
So for me it only gives +2 Encumbrance as shown. *checked, confirmed, problem solved …
But than i saw that little infobox that says …
Bonus Survival and Encumbrance
So yes you are absolutely right. This Mace has to give Survival Bonus too, but it doesnt.
So for the Devs, Item " The Unintelligible" ID: 51549 doesnt give Survival as quoted.