Add new dataset and config layer to map keeping old datasets and config layers

I am calling the addDataToMap as in the vis-academy example.
However when I call the function again when there is some user input the old data is lost, except when I remove the config version then the data is kept but the config mapState is lost.

For example if the config is this:
let mapConfig = self.getMapConfig();
mapConfig.config.visState.layers = (a layer array containing all the config visState layers for each dataset)
**delete mapConfig.version;**
self.props.dispatch(
addDataToMap({
datasets: dataset,
config: mapConfig,
options: { readOnly: false }
})
);
The map state is reset, and if the mapConfig.version is not removed the the previous datasets are lost.