WFM Wrap-up Code 400 via Terraform

Just noticed that applying genesyscloud_wfm_schedule_group fails with HTTP 400. Environment: US-1 Prod. Provider v1.15.4. Config sets wrap_up_code_id to a valid UUID from existing WFM config. Error: POST /api/v2/wfm/schedule-groups: 400 Bad Request. Payload validation rejects the ID format despite API docs allowing it. Any workaround in HCL or is this a provider bug?