Heavy helmet recipes are missing from T4 armourers skills

Game mode: [Singleplayer, current live version]
Problem: [Bug]
Region: [Here]

Heavy Plated Helmets and Horned Heavy Plated Helmets can’t be crafted by T4 armourers because the recipes does not shown in the armourer bench! I have more than one T4 armourer but none of them can craft them any more! Also their is a heavy leather helmet that can be found in the admin panel but it can’t be crafted! Why? Is that a bug too?

Steps on how to reproduce issue: