WFM Schedule Import 409 Conflict via REST API

Need some help troubleshooting schedule imports. Using genesyscloud_wfm_user_schedule in Terraform v1.12.4.

API returns 409 Conflict. Message states overlapping shift detected for resource ID. The HCL defines distinct time windows with no overlap.

Environment is Sydney staging. Timezone config matches UTC+11. JSON payload validates locally.

Checking if provider handles DST transitions incorrectly for Australian summer time.