Unsolved Mesh doesn't appear

I'm pretty sure the name is correct:

Code:

}
"scintilla_nbplates": {
    "information":{
        "authors":"Turbo49",
        "name":"N°27",
        "value":50,
    },
    "slotType" : "scintilla_numberplates",
    "flexbodies": [
        ["mesh", "[group]:", "nonFlexMaterials"],
        ["scintilla_nbplate_L", ["scintilla_quarterpanel_L"]],
        ["scintilla_nbplate_R", ["scintilla_quarterpanel_R"]],
        ["scintilla_nbplate_F", ["scintilla_hood"]]
    ],
},
}

Code:

{
    "scintilla_nbplates": {
        "name": "scintilla_nbplates",
        "mapTo": "scintilla_nbplates",
        "class": "Material",
        "Stages": [{
                "ambientOcclusionMap": "/vehicles/common/null.dds",
                "baseColorMap": "/vehicles/scintilla/bodywork/numberplates/nbnumberplate.color.png",
                "metallicFactor": 0,
                "metallicMap": "/vehicles/common/null.dds",
                "normalMap": "/vehicles/common/null_n.dds",
                "roughnessMap": "/vehicles/common/null3.dds"
            },
            {
                "baseColorMap": "/vehicles/scintilla/bodywork/numberplates/nbnumberplate.color.png",
                "diffuseMapUseUV": 1,
                "ambientOcclusionMap": "/vehicles/common/null.dds",
                "instanceDiffuse": true,
                "metallicFactor": 0,
                "normalMap": "/vehicles/common/null_n.dds",
                "opacityMap": "/vehicles/common/null3.dds",
                "roughnessFactor": 0.4
            },
            {},
            {}
        ],
        "activeLayers": 2,
        "dynamicCubemap": true,
        "version": 1.5
    }
}

Weird thing is, the front one is showing up, but not the side ones

 

make sure that you activate “double sided materials“ in the material editor under “advanced - all layers“
otherwise check how backface culling affects the material