Provisional fix for armors not showing up on servers. I missed a bit of how minecraft does armor materials now.

Author: Waterpicker

common/src/main/java/generations/gg/generations/core/generationscore/common/world/item/armor/GenerationsArmorMaterials.java

@@ -10,6 +10,7 @@
 import net.minecraft.core.Holder;
 import net.minecraft.core.registries.BuiltInRegistries;
 import net.minecraft.core.registries.Registries;
+import net.minecraft.resources.ResourceLocation;
 import net.minecraft.sounds.SoundEvent;
 import net.minecraft.sounds.SoundEvents;
 import net.minecraft.world.item.*;
@@ -53,7 +54,7 @@ public static RegistrySupplier<ArmorMaterial> register(String name, int durabili
             map.put(ArmorItem.Type.LEGGINGS, slotProtections[1]);
             map.put(ArmorItem.Type.CHESTPLATE, slotProtections[2]);
             map.put(ArmorItem.Type.HELMET, slotProtections[3]);
-        }), enchantmentValue, SoundEvents.ARMOR_EQUIP_IRON, Suppliers.memoize(() -> Ingredient.of(repairIngredient.get())), List.of(), toughness, knockbackResistance));
+        }), enchantmentValue, SoundEvents.ARMOR_EQUIP_IRON, Suppliers.memoize(() -> Ingredient.of(repairIngredient.get())), List.of(new ArmorMaterial.Layer(GenerationsCore.id(name)), toughness, knockbackResistance));
     }
 
     public static RegistrySupplier<ArmorMaterial> register(String name, int durabilityMultiplier, int[] slotProtections, int enchantmentValue, Supplier<Item> repairIngredient) {