Auric weapon craft.
I doubt this is actually a bug.
When making the final Auric weapon, you don’t use a recipe sheet but rather use the discovery system. The inscriptions you mention are of those that require a separate recipe sheet in order to craft the weapon.
The wiki could use rewording in this case, from “any Orichalcum Imbued Inscription” to “any crafting vendor Orichalcum Imbued inscription”.
You can always just make the Auric weapon with a Berserker inscription, make another plain Viper/Cele weapon then transmute it to the Auric skin. You’ll probably find another character of yours that will have use for the Berserker weapon.