How to fix Mongoose / mongo, not respecting mongoose model / schema

I am trying to assign a role property to users and have declared that in the schema but mongodb is ignoring it, if I define a default it will only set the default value in DB and not the one defined in the request.and if I remove the default value it will not set "role" at all.

Usermodel ⬇

    const userSchema = new mongoose.Schema({
  name: {
    type: String,
    required: [true, "Name is required"],
  },
  email: {
    type: String,
    required: [true, "Email is required"],
    unique: true,
    lowercase: true,
    validate: [validator.isEmail, "Please provide a valid email"],
  },
  photo: String,
  role: {
    type: String,
    enum: ["user", "moderator", "admin"],
    default: "user",
  },
  password: {
    type: String,
    required: [true, "Provide a password, at least 8 characters"],
    minlength: 8,
    select: false, // to exlude it from respond data.
  },
  confirmPassword: {
    type: String,
    required: [true, "Please confirm your password"],
    validate: {
      validator: function (cnfmPass) {
        return cnfmPass === this.password;
      },
      message: "Passwords do not match",
    },
  },

My post Request

    {
    "name": "Test user",
    "email": "test@user.com",
    "role": "admin",
    "password": "pass1234",
    "confirmPassword": "pass1234"
}

the result ⬇

_id: 63245a920714153bfc66b6c3
role: **"user"**
name: "Test user"
email: "test@user.com"
password: "$2a$12$8W3VvkZBRhUGjEgUCN9iducr0VLntyEPCweeoqJ53ToMzGSZy29pi"
__v: 0