The design is based on an expected workflow, where you add all lights before actually using LightMix to adjust them - using the automatic button to generate LightMixes can't carry across the settings really because what comes out of the auto generation could have changed dramatically, and it would be hard or impossible to know which color and intensity settings are meant to apply to which LightSelect. The same with saving and loading, the LightMix set up could be very different.
So the expected workflows are
- Create all lights, use Automatic, adjust Lightmix; for any extra lights added (which should be only a few by this point), manually add them to the LightMix
or
- Create some lights, use Automatic, PLAY with LightMix but not set anything up that is final that you want to keep just as a way of testing the LightMix set up, use Automatic to add more lights (resetting everything), repeat until you have all lights added, then start adjusting LightMix for final values.