[Bug]: Terraform doesn't detect change when an OU as deployment target has been removed

[bebold-jhr]

Terraform Core Version

1.9.x

AWS Provider Version

5.84.0

Affected Resource(s)

• aws_cloudformation_stack_set_instance

Expected Behavior

Terraform detects that an organizational unit has been removed from organizational_unit_ids in the deployment_targets block and acts accordingly. Probably will result in a replace (destroy + create).

Actual Behavior

No changes detected.

Relevant Error/Panic Output Snippet

Terraform Configuration Files

resource "aws_cloudformation_stack_set" "####" {
  depends_on = [
    aws_organizations_organization.this,
  ]

  name             = "####"
  permission_model = "SERVICE_MANAGED"

  auto_deployment {
    enabled                          = true
    retain_stacks_on_account_removal = false
  }

  managed_execution {
    active = false
  }

  operation_preferences {
    max_concurrent_percentage    = 100
    failure_tolerance_percentage = 100
    region_concurrency_type      = "PARALLEL"
  }

  capabilities = ["CAPABILITY_NAMED_IAM"]

  parameters = {
    #### = ####
  }

  template_body = file("####.yml")

  lifecycle {
    ignore_changes = [administration_role_arn]
  }
}

resource "aws_cloudformation_stack_set_instance" "####" {
  stack_set_name = aws_cloudformation_stack_set.####.name
  retain_stack   = false
  call_as        = "SELF"

  deployment_targets {
    organizational_unit_ids = [
      aws_organizations_organizational_unit.####.id, // OU 1
      // aws_organizations_organizational_unit.####.id, // OU 2
    ]
  }

  operation_preferences {
    max_concurrent_percentage    = 100
    failure_tolerance_percentage = 100
    region_concurrency_type      = "PARALLEL"
  }
}

Steps to Reproduce

• Create the StackSet using the code snippet and a single OU in aws_cloudformation_stack_set_instance => deployment_targets.organizational_unit_ids
• Terraform apply
• Add a second OU
• Terraform apply
• Remove the second OU again
• Terraform plan

Debug Output

No response

Panic Output

No response

Important Factoids

No response

References

No response

Would you like to implement a fix?

No

[github-actions]

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