Hello,
I've come across a bug. If FP is disabled in CustomEdit it always displays one object in the Viewport. Usually in the position of the FP itself. I.e. if the FP has position 0,0,0 it displays in 0,0,0 for example a tree. However, this pointcloud cannot be selected in the standard way by clicking on the PointCloud, you have to click on the FP icon or via ForestLister.