SKE: inconsistent result after apply

[HartmannVolker]

Description

After changing my node_pool configuration I saw this error in the terraform output:

│ Error: Provider produced inconsistent result after apply
│ 
│ When applying changes to module.prod_cluster.stackit_ske_cluster.this,
│ provider "provider[\"registry.terraform.io/stackitcloud/stackit\"]"
│ produced an unexpected new value: .node_pools[1].max_unavailable: was null,
│ but now cty.NumberIntVal(0).
│ 
│ This is a bug in the provider, which should be reported in the provider's
│ own issue tracker.
╵
╷
│ Error: Provider produced inconsistent result after apply
│ 
│ When applying changes to module.prod_cluster.stackit_ske_cluster.this,
│ provider "provider[\"registry.terraform.io/stackitcloud/stackit\"]"
│ produced an unexpected new value: .node_pools[1].labels: was null, but now
│ cty.MapValEmpty(cty.String).
│ 
│ This is a bug in the provider, which should be reported in the provider's
│ own issue tracker.
╵

I created a node pool with maximum = "1" & max_surge = "1". max_unavailable & labels are both unset in my terraform config.

The error has resolved after a second apply.

Actual behavior

Errors are shown after apply.

Expected behavior

No Errors are shown after apply.

Environment

• OS: MacOS 26.2
• Terraform version (see terraform --version): v1.13.5
• Version of the STACKIT Terraform provider: 0.76.0

[Fyusel]

Hi @HartmannVolker,
thank you for reporting this issue.

Can you please be so kind an provide the full configuration? This saves us a lot of time.

[HartmannVolker]

It's not as easy, because we have a modulized setup. This is how the resource config should look like in the end:

resource "stackit_ske_cluster" "this" {
  project_id             = "project-id"
  name                   = "production"
  kubernetes_version_min = "1.32"
  network = {
    id = "network-id"
  }
  node_pools = [
    {
      name               = "g1-2-50"
      machine_type       = "g1.2"
      minimum            = "2"
      maximum            = "8"
      max_surge          = "3"
      volume_size        = 50
      availability_zones = ["eu01-1", "eu01-2", "eu01-3"]
    },
    {
      name               = "g1a-8d-50"
      machine_type       = "g1a.8d"
      minimum            = "0"
      maximum            = "1"
      max_surge          = "1"
      volume_size        = 50
      availability_zones = ["eu01-1"]
      taints = [
        {
          key    = "project-x-nightly-job"
          value  = "exclusive"
          effect = "NoSchedule"
        }
      ]
    },
  ]
  maintenance = {
    enable_kubernetes_version_updates    = true
    enable_machine_image_version_updates = true
    start                                = "01:00:00Z"
    end                                  = "02:00:00Z"
  }
}