Bottom face of reflection probes gets nasty shadowmap seam, which is probably due to csm pancaking.

The quality of csm shadows on the downward facing face of the boxreflections cubemaps gets very good shadow quality probably due to pancaking, thus creating an obvious seam in the shadows between the side faces who have a lower quality than the high quality bottom face.

Solution: we should probably run the same csm pancake settings on all faces of the cubemap to avoid seams.