I'm creating a material using an item from the Betweenlands called Slimy Bones. The item has metadata 14. When I look at the item in the Materials and You book, it shows a snail shell, which has the same item ID as the slimy bones, but has metadata 0.

    val slime_bone = MaterialBuilder.create("slimey_bone");
    slime_bone.color = 0xa7d799;
    slime_bone.representativeItem = <item:thebetweenlands:items_misc:14>;