[Bug]: `ipv4` addr deletion on `server` import

[netzego]

What happened?

ipv4 addr get deleted (note: no deletion is shown via tofo plan) and this will result in an error msg (1) (see below). this are the steps i took:

1. create primary-ip resource (ipv4 and ipv4)
2. create server resource with resource from step 1.
3. import server resource (result in deleted ipv4 addr.)

after step 3. hcloud primary-ip list shows that the ipv4 is deleted, while the ipv6 addr works as expected. (also tested with delete-protection == true. this will fail with an error msg (2) on the first run, while a second run will recover from that err. due to the delete-protection the ipv4 will not be deleted. but this is clearly not the intended behavior.)

err msg 1

2026-04-12T23:29:00.464+0200 [ERROR] provider.terraform-provider-hcloud_v1.60.1: Response contains error diagnostic: @module=sdk.proto tf_req_id=72c54ae1-bda9-08bb-6b7f-bf2c59d415ce tf_rpc=ApplyResourceChange @caller=github.com/hashicorp/terraform-plugin-go@v0.29.0/tfprotov6/internal/diag/diagnostics.go:58 diagnostic_detail="" diagnostic_severity=ERROR diagnostic_summary="Primary IP with ID 126355586 not found (not_found, 409c8d7a6f94da1ef81e891dff29927b)" tf_proto_version=6.10 tf_provider_addr=registry.terraform.io/hetznercloud/hcloud tf_resource_type=hcloud_server timestamp="2026-04-12T23:29:00.464+0200"
2026-04-12T23:29:00.467+0200 [ERROR] vertex "hcloud_server.main" error: Primary IP with ID 126355586 not found (not_found, 409c8d7a6f94da1ef81e891dff29927b)

Error: Primary IP with ID 126355586 not found (not_found, 409c8d7a6f94da1ef81e891dff29927b)

  with hcloud_server.main,
  on server.tf line 20, in resource "hcloud_server" "main":
  20: resource "hcloud_server" "main" {

err msg 2

2026-04-12T23:00:42.255+0200 [ERROR] provider.terraform-provider-hcloud_v1.60.1: Response contains error diagnostic: tf_rpc=ApplyResourceChange @module=sdk.proto diagnostic_d
etail="" diagnostic_severity=ERROR diagnostic_summary="Primary IP deletion is protected (protected, fd8fafe3e6cadeefddd99a08968e0ef9)" tf_proto_version=6.10 tf_req_id=ac0c99b
7-e122-e748-86ef-752166a23e8f @caller=github.com/hashicorp/terraform-plugin-go@v0.29.0/tfprotov6/internal/diag/diagnostics.go:58 tf_provider_addr=registry.terraform.io/hetzne
rcloud/hcloud tf_resource_type=hcloud_server timestamp="2026-04-12T23:00:42.255+0200"
2026-04-12T23:00:42.258+0200 [ERROR] vertex "hcloud_server.main" error: Primary IP deletion is protected (protected, fd8fafe3e6cadeefddd99a08968e0ef9)

Error: Primary IP deletion is protected (protected, fd8fafe3e6cadeefddd99a08968e0ef9)

  with hcloud_server.main,
  on server.tf line 20, in resource "hcloud_server" "main":
  20: resource "hcloud_server" "main" {

What did you expect to happen?

an import server resource should not delete ipv4 addr. (the ipv4 addr resource is managed in an extra state file and thus i expected it will not be altered.)

Please provide a minimal working example

primary-ip resource

resource "hcloud_primary_ip" "ipv4" {
  name              = "test-ipv4"
  type              = "ipv4"
  location          = "fsn1"
  assignee_type     = "server"
  auto_delete       = false
  delete_protection = false
}

resource "hcloud_primary_ip" "ipv6" {
  name              = "test-ipv6"
  type              = "ipv6"
  location          = "fsn1"
  assignee_type     = "server"
  auto_delete       = false
  delete_protection = false
}

server resource

data "hcloud_primary_ip" "ipv4" {
  name = "test-ipv4"
}

data "hcloud_primary_ip" "ipv6" {
  name = "test-ipv6"
}

resource "hcloud_server" "main" {
  name        = "test"
  image       = "debian-13"
  server_type = "cx23"
  location    = "fsn1"
  keep_disk   = true
  backups     = false
  ssh_keys    = [XXXXXXXX]

  public_net {
    ipv4_enabled = true
    ipv4         = data.hcloud_primary_ip.ipv4.id
    ipv6_enabled = true
    ipv6         = data.hcloud_primary_ip.ipv6.id
  }
}

server import

data "hcloud_primary_ip" "ipv4" {
  name = "test-ipv4"
}

data "hcloud_primary_ip" "ipv6" {
  name = "test-ipv6"
}

data "hcloud_server" "main" {
  name = "test"
}

import {
  to = hcloud_server.main
  id = data.hcloud_server.main.id
}

resource "hcloud_server" "main" {
  name        = "test"
  server_type = "cx23"
  image       = "debian-13"
  ssh_keys    = [XXXXXXXX]

  public_net {
    ipv4_enabled = true
    ipv4 = data.hcloud_primary_ip.ipv4.id
    ipv6_enabled = true
    ipv6 = data.hcloud_primary_ip.ipv6.id
  }

  # prevent destroy and recreate of server resource on import
  lifecycle {
    ignore_changes = [
      image, ssh_keys
    ]
  }
}

version

version = "~> 1.60"