"Weapon Mastery (Abomination Vaults)" feat

So I was looking at potential feats for one of the players in my campaign today and the feat "Weapon Mastery (Abomination Vaults)" is listed in the Rules > Feats list. It says its from the Abomination Vaults book, which I own, but its directing me to the marketplace to purchase the book, which then says I already own that book.

However, looking through the book, I dont believe there are any feats included in the book, and the marketplace page doesn't list any feats are included with the book, so where is this feat coming from?

You have to manually look it up after creating the character, if it even exists. It's a temporary stopgap until the character builder fix is done.

Quote from MaedraDawnkeeper >>

You have to manually look it up after creating the character, if it even exists. It's a temporary stopgap until the character builder fix is done.

 They're not all like that though. "Weapon Mastery (Grim Hollow: Player's Pack)", "Weapon Mastery (Steinhardt's)", "Weapon Mastery (The Gunslinger Class)", etc

Those ones all show up on the feats page along side the abomination vaults one, and they all display just fine. The Abomination Vaults one doesn't recognize that the book is purchased though.

The only other one that seems to be doing this now that I have looked at them all is the one for The Pugilist Class.

I own that book as well but the weapon mastery doesn't acknowledge that.

Are your entitlements synced?

Quote from jl8e >>

Are your entitlements synced?

 Mine are, & Kino's link redirects to the book in the marketplace that I already own.