Default in variable object

Terraform
1

should this work, if the var passed on, doesn’t have the default value filled in?

variable “variable” {
  description = “configs”
  type = list(
    object(
      {
        arg1 = string
        arg2 = string
        arg3 = string
        arg4 = string
      }
    )
  )
  default = [
    {
        arg1 = null
        arg2 = null
        arg3 = null
        arg4 = “foobar”
    }
  ]
}

it is failing with

Error: Invalid value for input variable

The environment variable TF_VAR_variable does not contain a valid value for
variable “variable”: element 0: attribute “arg4” is required.