Bug on durability

I created a custom metal facemask below. But it appear with half durability. How to fix it?
On other case, there is no bug on badit Guard Gear and roadsign kilt.

{
  "Shortname": "metal.facemask",
  "SkinId": 2330112934,
  "Name": "S3 Metal Facemask",
  "Description": "蒼界",
  "Display the cooking icon?": false,
  "UI Settings": {
    "Name Color (or use <color></color> in name)": "1 1 1 1",
    "Frame Color": "0.94 0.75 0.15 1"
  },
  "Protection": {
    "Hunger": 0.0,
    "Thirst": 0.0,
    "Cold": 0.0,
    "Drowned": 0.0,
    "Heat": 0.0,
    "Bleeding": 0.0,
    "Poison": 0.0,
    "Suicide": 0.0,
    "Bullet": 50.0,
    "Slash": 70.0,
    "Blunt": 70.0,
    "Fall": 0.0,
    "Radiation": 0.0,
    "Bite": 8.33,
    "Stab": 70.0,
    "Explosion": 8.33,
    "RadiationExposure": 0.0,
    "ColdExposure": -4.17,
    "ElectricShock": 0.0,
    "Arrow": 50.0,
    "BeeSting": 0.0,
    "OxygenExposure": 0.0
  }
}

Its also happen on 3.0.2 version.

 On 3.0.2 Custom.json

{
      "Short system name for the new item. Must be unique, contain no spaces, and must not be changed after items are created.": "metal.facemask.s3",
      "Short name of the parent item on the basis of which the item will be created. Can be changed.": "metal.facemask",
      "Default Icon (Skin ID from workshop)": 0,
      "Protection Config": "metal.facemask.s3",
      "Can only be worn by NPCs": false,
      "Prevents Mounting": false,
      "Block From Mannequin": false,
      "Wearable": {
        "Occupation Over": "HeadTop, Face",
        "Occupation Under": 0
      },
      "Armor Properties": {
        "Area": "Head"
      },
      "Break Effect": ""
    }

Protection Config
 

{
  "Comments": "",
  "Density (0-100)": 1.0,
  "Protection percentage by damage type": {
    "Generic": 0.0,
    "Hunger": 0.0,
    "Thirst": 0.0,
    "Cold": 0.0,
    "Drowned": 0.0,
    "Heat": 0.0,
    "Bleeding": 0.0,
    "Poison": 0.0,
    "Suicide": 0.0,
    "Bullet": 55.0,
    "Slash": 77.0,
    "Blunt": 77.0,
    "Fall": 0.0,
    "Radiation": 0.0,
    "Bite": 9.13,
    "Stab": 77.0,
    "Explosion": 9.163,
    "RadiationExposure": 0.0,
    "ColdExposure": -4.587,
    "Decay": 0.0,
    "ElectricShock": 0.0,
    "Arrow": 55.0,
    "AntiVehicle": 110.0,
    "Collision": 110.0,
    "Fun_Water": 0.0,
    "BeeSting": 0.0
  }
}

It might be a plugin conflict.

@0xF

But there is no other modifing item plugin.

I just use CustomItemDefinitions, CustomizableWeapon and CustomizableProtection.

Have you changed the item base shortname after initial creation? If so, the previous shortname is used. Restart the server in this case.