Delete dataset API does not delete COS (Blob Storage) object

The delete dataset API of seismic-store-service, calls the storage service POST delete record API. This API deletes the object from COS(Blob Storage) belonging to the dataset. However, the COS object is available even though the response is 204 No Content. We realize that storage service POST delete is just doing soft delete. We wanted to confirm if this is the expected behavior.