Copy SQL Azure Hyperscale
Once a database is migrated to Hyperscale, it cannot be migrated
directly to a non-Hyperscale service tier. At present, the only way to
migrate a database from Hyperscale to non-Hyperscale is to
export/import using a BACPAC file or other data movement technologies
(Bulk Copy, Azure Data Factory, Azure Databricks, SSIS, etc.)

Source is here.
Database copy for Hyperscale is now in Public preview as announced here on Sep 22, 2020.