Here you can see that it works for the BSP but not for the mesh-plane:
Both have the same scale and use the same material. Yet the plane does not work. How is that possible? I also tried negative values or dividing by 1 / scale but nothing works. The planes are always like that.
Note that I imported my own plane from Blender and did not use the one from UE4 itself because this project does not have the starter content included.