Thank you for this!
@animjo: In Foliage section, click on some of your foliage in the list and under the mesh you will see drop down menu “Component Class”. Default is FoliageInstancedStaticMeshComponent. Click on magnifying glass and it will navigate you to this C++ Class in Engine Content, right click on it and select “Create Blueprint class based on…”, save file, open it and you will see option “Use Dynamic Instance Buffer”. Then apply this new Blueprint Class to your foliage (in Foliage section in that drop down menu under the mesh). Done and working 