[BUG] MAC addresses re-generated on every run

[soakes]

Describe the bug

After initial creation of machine, if you re-run terraform apply, that even though the mac addresses are provisioned, will replace them with new ones as they are not defined in the config/manifest.

      ~ network_device {
            bridge      = "vmbr0"
            enabled     = true
          - mac_address = "9E:F9:DC:DE:62:E0" -> null
            model       = "virtio"
            rate_limit  = 0
            vlan_id     = 4001
        }
      ~ network_device {
            bridge      = "vmbr0"
            enabled     = true
          - mac_address = "7E:E0:C1:7D:32:F4" -> null
            model       = "virtio"
            rate_limit  = 0
            vlan_id     = 4002
        }
      ~ network_device {
            bridge      = "vmbr0"
            enabled     = true
          - mac_address = "12:A3:7C:E6:C0:B6" -> null
            model       = "virtio"
            rate_limit  = 0
            vlan_id     = 4003
        }
      ~ network_device {
            bridge      = "vmbr0"
            enabled     = true
          - mac_address = "B6:78:F8:71:85:6C" -> null
            model       = "virtio"
            rate_limit  = 0
            vlan_id     = 4004
        }
    }

To Reproduce
Run terraform twice with example code

provider "proxmox" {
  virtual_environment {
    endpoint = var.pm_api_url
    username = var.pm_user
    password = var.pm_password
    insecure = "false"
  }
}

resource "proxmox_virtual_environment_vm" "vm" {
  vm_id     = 27151
  pool_id   = "prod"
  count      = 1
  name = "testvm01"
  node_name = "pve01"
  cpu {
    cores = "2"
    sockets = "2"
  }
  clone {
    datastore_id = "prod-vm"
    vm_id = "2002"
  }
  disk {
    datastore_id = "prod-vm"
    size         =  30
  }
  memory {
    dedicated = 4096
  }
  agent {
    enabled = true
    trim    = true
  }

  initialization {
    datastore_id = "prod-vm"


    ip_config {
      ipv4 {
        address =  "172.27.1.50/24"
        gateway = "172.27.1.1"
      }
    }
    ip_config {
      ipv4 {
        address =  "172.27.2.50/24"
      }
    }
    ip_config {
      ipv4 {
        address =  "172.27.3.50/24"
      }
    }
    ip_config {
      ipv4 {
        address =  "172.27.4.50/24"
      }
    }
    user_account {
      keys     = ["${trimspace(var.ssh_public_key)}"]
      username = "root"
    }
  }

  network_device {
    vlan_id = "4001"
  }

  network_device {
    vlan_id = "4002"
  }

  network_device {
    vlan_id = "4003"
  }

  network_device {
    vlan_id = "4004"
  }

}

Expected behavior
If MAC address is already provisioned and known in the state file, it should then not regenerate MAC addresses. However if a mac address is defined in the config, then this should be used instead.

The only solution right now is to generate manually MAC addresses then encode them in the config or use lifecycle ignore.

Screenshots