Aggregate write with mapper => mapper called 2x

The following command (aggregate write) creates correctly but calls the mapper twice. Is this expected behaviour?

        mapper: :my_mapper,
        use: :timestamps, plugins_options: {timestamps: {timestamps: %i[created_at updated_at]}})

Removing the combine causes the mapper to be called once. Is mapping a combined create command supported?

Not expected. Could you report an issue, preferably with a reproduction script or failing spec?

Will do. In the mean time do you have any suggested workarounds?