TF plan showing recreate cluster is needed when a new subnet id is added to output variables

[putharekulu]

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Terraform Version and Provider Version

Terraform 0.13.5 (Used with OCI Shepherd)
OCI provider 5.45.0

Affected Resource(s)

oci_containerengine_cluster, oci_containerengine_node_pool

Terraform Configuration Files

resource "oci_containerengine_cluster" "cluster" {

  compartment_id       = var.compartment_id
  kubernetes_version = var.controlplane_kubernetes_version
  name               = var.name
  vcn_id             = var.service_vcn_id
  type                 = var.cluster_type

  endpoint_config {
    is_public_ip_enabled = true
    subnet_id            = var.k8s_endpoint_subnet_id
  }

  kms_key_id = var.encrypt_etcd ? var.kms_key_id : null

  options {

    add_ons {
      is_kubernetes_dashboard_enabled = var.is_kubernetes_dashboard_enabled
      is_tiller_enabled               = false
    }

    kubernetes_network_config {
      pods_cidr     = var.pods_cidr
      services_cidr = var.services_cidr
    }

    service_lb_subnet_ids = [var.service_lb_subnet_id]
  }
}

network module

// Test
resource "oci_core_subnet" "test_subnet" {
  cidr_block = 10.10.200.0/24
  compartment_id = var.compartment_id
  vcn_id = oci_core_vcn.service_vcn.id
  prohibit_public_ip_on_vnic = true
  display_name = "test_${oci_core_vcn.service_vcn.display_name}"
  dns_label = "justatest"
}

output "just_a_test" {
  value = oci_core_subnet.test_subnet.id
}

Expected Behavior

With adding a new subnet and output the subnet ID, no changes should be shown in terraform plan for OKE module.

Actual Behavior

Just add the subnet code and the terraform plan shows just creating of the subnet which is correct.
When I add an output variable to get the id of the new subnet, TF plan shows terminating and rebuilding the oke cluster. Plan shows this change

~ endpoint_config { 
            is_public_ip_enabled = true 
          - nsg_ids              = [] -> null 
          ~ subnet_id            = "ocid1.subnet.oc1.iad.xxxxxxxx -> (known after apply) # forces replacement 
        } 

Steps to Reproduce

terraform plan by adding new subnet and output variable

[tf-oci-pub]

Thank you for reporting the issue. We have raised an internal ticket to track this. Our service engineers will get back to you.