[Bug]: Null value found in ssh_keys list from hcloud_server resource

[zvonimir907]

What happened?

Since the release of version 1.49.1, resource hcloud_server throws the following error, on terraform plan, when trying to fetch the id form hcloud_ssh_key data source:

╷
│ Error: Null value found in list
│ 
│   with module.hetzner_empty_instance[0].hcloud_server.server[0],
│   on ../../modules/hetzner/server/servers.tf line 15, in resource "hcloud_server" "server":
│   15:   ssh_keys     = [data.hcloud_ssh_key.provider_ssh_key.id]
│ 
│ Null values are not allowed for this attribute value.
╵

What did you expect to happen?

The last working version of provider was 1.49.0. Where the id from the data source could be fetched by name.

I've hard coded the version of the provider to 1.49.0. Where things work as expected.

Please provide a minimal working example

data "hcloud_ssh_key" "provider_ssh_key" {
  name = var.provider_ssh_key_name
}

resource "hcloud_server" "server" {
  name        = var.server_name
  server_type = var.server_type
  image       = var.server_image
  ssh_keys    = [data.hcloud_ssh_key.provider_ssh_key.id]
}

[jooola]

@zvonimir907 I am not able to reproduce your issue, could you maybe add the following to your config:

output "debug" {
  value = data.hcloud_ssh_key.provider_ssh_key
}

And provide the debug logs when running terraform plan:

TF_LOG=DEBUG TF_LOG_PATH=debug.log terraform plan