Machine data sources do not work correctly

[mcasperson]

Describe the bug

Given the following Terraform:

terraform {

  required_providers {
    octopusdeploy = { source = "OctopusDeployLabs/octopusdeploy", version = "0.13.2" }
  }
}

variable "octopus_server" {
  type        = string
  nullable    = false
  sensitive   = false
  description = "The URL of the Octopus server e.g. https://myinstance.octopus.app."
}
variable "octopus_apikey" {
  type        = string
  nullable    = false
  sensitive   = true
  description = "The API key used to access the Octopus server. See https://octopus.com/docs/octopus-rest-api/how-to-create-an-api-key for details on creating an API key."
}
variable "octopus_space_id" {
  type        = string
  nullable    = false
  sensitive   = false
  description = "The ID of the Octopus space to populate."
}

provider "octopusdeploy" {
  address  = "${var.octopus_server}"
  api_key  = "${var.octopus_apikey}"
  space_id = "${var.octopus_space_id}"
}

data "octopusdeploy_cloud_region_deployment_targets" "cloud_targets" {
  skip = 0
  take = 100
}

output "cloud-targets" {
  value = data.octopusdeploy_cloud_region_deployment_targets
}

And a space that has cloud region targets, the data.octopusdeploy_cloud_region_deployment_targets.cloud_region_deployment_targets property is null.

Steps to reproduce

1. Run the example terraform above against a space with cloud region targets
2. Note the output shows the cloud_region_deployment_targets is null.

Expected behavior
The cloud_region_deployment_targets property should be a list of cloud regions targets in the space.

Logs and other supporting information

Changes to Outputs:
  + cloud-targets = {
      + cloud_region_deployment_targets = null
      + deployment_id                   = null
      + environments                    = null
      + health_statuses                 = null
      + id                              = "CloudRegionDeploymentTargets 2023-12-05 04:27:03.293728771 +0000 UTC"
      + ids                             = null
      + is_disabled                     = null
      + name                            = null
      + partial_name                    = null
      + roles                           = null
      + shell_names                     = null
      + skip                            = 0
      + take                            = 4
      + tenant_tags                     = null
      + tenants                         = null
      + thumbprint                      = null
    }

Screenshots
If applicable, add screenshots to help explain your problem.

Environment and versions:

• OS: 'Linux'
• Octopus Server Version: [e.g. 2024.1]
• Terraform Version: [e.g. 1.6.5]
• Octopus Terraform Provider Version: [e.g. 0.13.2]

Additional context
Add any other context about the problem here.

The line d.Set("cloud_region_deployment_targets", flattenedCloudRegionDeploymentTargets) in data_source_cloud_region_deployment_targets.go attempts to set the cloud_region_deployment_targets property to the list of targets. However, this function call returns an error that is swallowed. This means Terraform returns a null list. I haven't yet worked out why this function call returns an error.

[mcasperson]

The error that is swallowed is Invalid address to set: []string{"cloud_region_deployment_targets", "0", "endpoint"}