[Bug]: hcloud_server labels output drift

[astephanh]

What happened?

terraform plan will show labels drift after creating server without labels, when labels are defined in output

What did you expect to happen?

no drift

Please provide a minimal working example

output "server" {
  value = hcloud_server.node1
}

resource "hcloud_network" "network" {
  name     = "network"
  ip_range = "10.0.0.0/16"
}

resource "hcloud_network_subnet" "subnet1" {
  network_id   = hcloud_network.network.id
  type         = "cloud"
  network_zone = "eu-central"
  ip_range     = "10.0.1.0/24"
}

resource "hcloud_server" "node1" {

  image       = "debian-12"
  location    = "fsn1"
  name        = "tf-test"
  server_type = "cx33"

  public_net {
    ipv4_enabled = false
    ipv6_enabled = false
  }

  network {
    network_id = hcloud_network.network.id
    alias_ips  = []
  }

}

terraform {
  required_version = ">= 1.12"

  required_providers {
    hcloud = {
      source  = "hetznercloud/hcloud"
      version = ">= 1.60"
    }
  }
}

terraform plan after terraform apply will show:

hcloud_network.network: Refreshing state... [id=11910270]
hcloud_network_subnet.subnet1: Refreshing state... [id=11910270-10.0.1.0/24]
hcloud_server.node1: Refreshing state... [id=120135417]

Note: Objects have changed outside of Terraform

Terraform detected the following changes made outside of Terraform since the last "terraform apply" which may have affected
this plan:

  # hcloud_server.node1 has changed
  ~ resource "hcloud_server" "node1" {
        id                         = "120135417"
      + labels                     = {}
        name                       = "tf-test"
        # (19 unchanged attributes hidden)

        # (2 unchanged blocks hidden)
    }


Unless you have made equivalent changes to your configuration, or ignored the relevant attributes using ignore_changes, the
following plan may include actions to undo or respond to these changes.

──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────

Changes to Outputs:
  ~ server = {
        id                         = "120135417"
      ~ labels                     = null -> {}
        name                       = "tf-test"
        # (26 unchanged attributes hidden)
    }

You can apply this plan to save these new output values to the Terraform state, without changing any real infrastructure.