https://pastebin.com/NRF1jkEu

mcenderdragon/Futurepack-API#687

Made a PR to fix this MinecraftForge/MinecraftForge#7222

hi, FuturepaclDev here, the code in Question is:

	@Override
	public int getMaxDamage(ItemStack stack)
	{
		int lvl = EnchantmentHelper.getEnchantmentLevel(Enchantments.UNBREAKING, stack);
		return super.getMaxDamage(stack) +(100 * lvl);
	}

EnchantmentHelper.getEnchantmentLevel, checks if Dynamic Enchanments are applyable, this checks if the ItemSTack is damageable, which directly check the maxDamage again. My best guess right now is to make a forge PR so patch ItemStack to call Item#isDamageable instead.