Modifying Override Parameters on NiagaraActor blueprints created from a System Actor does not work

Modifying Override Parameters on NiagaraActor blueprints created from a System Actor does not work

The System component appears to only use the default value set in the System. 

This issue does not occur if you manually create a blueprint with the NiagaraActor class selected. 

1. Open a project
2. Create and open a new Niagara system with the fountain emitter
3. Set the particles color to a user parameter
4. Place the System in the level 
5. With the instance selected, select "Blueprint/Add Script" in the details panel
6. In Parent Class, select NiagaraActor > click "select"
7. In the new Blueprint, modify the override parameter (note that nothing happens) > click compile (note that the override parameter is reset to the white)
8. In the level and with the BP actor selected, attempt to modify the override parameter

Result: The system continues to spawn white particles

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