Terraform genesyscloud_routing_queue skills not applying via CX as Code

Trying to define a queue with specific skills using the CX as Code provider. The queue creates, but the skills block seems ignored. Here’s the config:

resource "genesyscloud_routing_queue" "test" {
 name = "Support"
 skills {
 skill_id = "123"
 }
}

Plan shows no changes to skills, apply succeeds, but the queue has zero skills in Genesys. Is the syntax wrong or do I need to reference the skill resource differently?