Hi, unfortunately this is a limitation of the Corona implementation. You can find the list of supported features here
We are in conversations with the Corona team to support more features in the future, but that requires important changes in the Corona engine.
As workaround, you would create a set of separated geometries with different IDs, and randomize them using the "Randomize" operator.
Obviously this procedure requires a previous work to prepare it, but it's compatible with instancing.