Using dbForge for Postgre SQL (version 3.1.701)  I connect to a simple test database.  The DB happens to be in google cloud as a CloudSQL Postgres.   The db has tables in 3 schemas (public, immutable, version3).  I fire up the data generation wizard.  After initial parameters it shows me a list of tables to populate.    The only tables appearing are from the immutable schema.        Despite the schema name, connected user can write/create in all schemas.