[Bug]: hcloud_server.public_net.ipv4 also updates hcloud_primary_ip.assignee_id causing a drift

[brano543]

What happened?

resource "hcloud_primary_ip" "nat_vpn_gateway_public_ip" {
  type              = "ipv4"
  name              = "nat_vpn_gateway_public_ip"
  datacenter        = "nbg1-dc3"
  auto_delete       = false
  assignee_type     = "server"
  delete_protection = true
}

resource "hcloud_firewall" "nat_vpn_gateway_firewall" {
  name = "nat-gateway-firewall"
}

resource "hcloud_server" "nat_vpn_gateway" {
  name        = "nat-vpn-gateway"
  server_type = "cax11"
  image       = "ubuntu-24.04"
  datacenter  = "nbg1-dc3" 

  firewall_ids = [hcloud_firewall.nat_vpn_gateway_firewall.id]

  public_net {
    ipv4_enabled = true
    ipv4         = hcloud_primary_ip.nat_vpn_gateway_public_ip.id
    ipv6_enabled = false
  }

  delete_protection        = true
  rebuild_protection       = true
  shutdown_before_deletion = true
}

While above code correctly creates a public IP and assigns it to the server, running "tofu plan -refresh-only" will detect below drift.

# hcloud_firewall.nat_vpn_gateway_firewall has changed
  │   ~ resource "hcloud_firewall" "nat_vpn_gateway_firewall" {
  │         id     = "2003008"
  │         name   = "nat-gateway-firewall"
  │         # (1 unchanged attribute hidden)
  │
  │       + apply_to {
  │           + server = 61815540
  │         }
  │
  │         # (7 unchanged blocks hidden)
  │     }
  │
  │   # hcloud_primary_ip.nat_vpn_gateway_public_ip has changed
  │   ~ resource "hcloud_primary_ip" "nat_vpn_gateway_public_ip" {
  │       ~ assignee_id       = 0 -> 61815540
  │         id                = "84896341"
  │         name              = "nat_vpn_gateway_public_ip"
  │         # (7 unchanged attributes hidden)
  │     }

What did you expect to happen?

hcloud_firewall.nat_vpn_gateway_firewall.apply_to should have been changed by the given code and not in the cloud. This way it wouldn't show as a drift.

Please provide a minimal working example

See first section

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