Currently you can specify a landscape layer to prevent a foliage spawner from spawning on it. However, I have a spline that has a static mesh (for a road) on it. As long as the mesh is on the spline, the foliage tool will ignore the layer filter and spawn on top.
Is there a way in 4.24 (or higher) to exclude such a spline ? The paint/fill tool does not help because the landscape splines do not seem to be visible in the editor placement mode (only in landscape “manage” mode)