Skin only works in the inventory?

Hi, 
I set a few skins, for the rock and the hammer for example. If I craft these items, the skins are shown in the belt/inventory, but holding these items in my hands, the items have the standard skin. Does this plugin only affects the inventory?

Crafted item wit skin set (by the plugin):
crafted item with skin set

item crafted with manually (ingame set) set skin (no plugin use):
manually set
Thanks in advance

Having the same issue as well.