Cannot update value of network_interface.stack_type on google_compute_instance resources

[SarahFrench]

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Terraform Version

Terraform v1.5.7
on darwin_arm64

• provider registry.terraform.io/hashicorp/google v5.15.0

Affected Resource(s)

• google_compute_instance

Terraform Configuration

resource "google_service_account" "default" {
  account_id   = "my-custom-sa"
  display_name = "Custom SA for VM Instance"
}

resource "google_compute_instance" "default" {
  name         = "my-instance"
  machine_type = "n2-standard-2"
  zone         = "us-central1-a"

  tags = ["foo", "bar"]

  boot_disk {
    initialize_params {
      image = "debian-cloud/debian-11"
      labels = {
        my_label = "value"
      }
    }
  }

  // Local SSD disk
  scratch_disk {
    interface = "NVME"
  }

  network_interface {
    network    = "default"
    stack_type = "IPV4_ONLY"

    access_config {
      // Ephemeral public IP
    }
  }

  metadata = {
    foo = "bar"
  }

  metadata_startup_script = "echo hi > /test.txt"

  service_account {
    # Google recommends custom service accounts that have cloud-platform scope and permissions granted via IAM Roles.
    email  = google_service_account.default.email
    scopes = ["cloud-platform"]
  }
}

Debug Output

https://gist.github.com/SarahFrench/c15d40e63d01d15505e8578656bccff7

Expected Behavior

Can update network_interface.stack_type from IPV4_ONLY to IPV4_IPV6

Actual Behavior

Cannot update network_interface.stack_type from IPV4_ONLY to IPV4_IPV6

Steps to reproduce

1. terraform apply
2. Change network_interface.stack_type from IPV4_ONLY to IPV4_IPV6 in the config
   3.terraform apply => you'll see a plan to update the field, but after applying the plan the state is unchanged
3. terraform apply => there is still a plan to update the field

Important Factoids

When the update happens there is never a PATCH request sent to the compute API to update the resource. It appears a defect in the provider code stops the change happening.

References

No response

b/324394301

[github-actions]

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