Now that the new UDE environments are administrated via the same controls as the Dataverse via the PPAC, the Schema-Only copy should allow for the ERP-side environment to similarly copy with only tables/entities/configuration without the actual data. Having only the Dataverse side copy without data in this scenario is unintuitive behavior and will cause cross-platform data issues particularly when involving financial records that have various built-in locks and safeguards on them.