Houdini CSV in Niagara in Blueprints doesn't seem to work properly

See https://udn.unrealengine.com/questions/444762/how-to-change-niagara-system-exposed-parameters-in.html

I added the system directly to a blueprint. I've tried by put 5 systems in the scene with a different csv for each. When I reopened the scene the 5 systems had the same csv loaded.