Maybe not a "real" bug and caused by different settings but it is a bit confusing... Using `tm_style("natural")`, there is no clipping: ``` tm_shape(World, bbox = "FULL", crs = "+proj=ortho +lat_0=30 +lon_0=0") + tm_polygons() + tm_graticules() + tm_style("natural") ```  Without `tm_style()`, clipping occurs (e.g. USA): ``` tm_shape(World, bbox = "FULL", crs = "+proj=ortho +lat_0=30 +lon_0=0") + tm_polygons() + tm_graticules() ``` 