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
}
}