can't show 2D and 3D models at the same time about bevy_prototype_lyon HOT 2 CLOSED

use bevy::prelude::*;
use bevy_prototype_lyon::prelude::*;

const SHOW_2D: bool = true;
const SHOW_3D: bool = true;

fn main() {
    App::new()
        .insert_resource(Msaa::Sample4)
        .add_plugins(DefaultPlugins)
        .add_plugin(ShapePlugin)
        .add_startup_system(setup_system)
        .run();
}

fn setup_system(
    mut commands: Commands,
    mut meshes: ResMut<Assets<Mesh>>,
    mut materials: ResMut<Assets<StandardMaterial>>,
) {
    if SHOW_2D {
        let shape = shapes::RegularPolygon {
            sides: 6,
            feature: shapes::RegularPolygonFeature::Radius(200.0),
            ..shapes::RegularPolygon::default()
        };
        commands.spawn(Camera2dBundle {
            camera: Camera {
                order: 1,
                ..default()
            },
            camera_2d: Camera2d {
                clear_color: ClearColorConfig::None,
                ..default()
            },
            ..default()
        });
        commands.spawn((
            ShapeBundle {
                path: GeometryBuilder::build_as(&shape),
                ..default()
            },
            Fill::color(Color::CYAN),
            Stroke::new(Color::BLACK, 10.0),
        ));
    }

    if SHOW_3D {
        // cube
        commands.spawn(PbrBundle {
            mesh: meshes.add(Mesh::from(shape::Cube { size: 2.0 })),
            material: materials.add(Color::rgb(0.8, 0.7, 0.6).into()),
            ..Default::default()
        });
        // light
        commands.spawn(PointLightBundle {
            transform: Transform::from_xyz(4.0, 8.0, 4.0),
            ..Default::default()
        });
        // camera
        commands.spawn(Camera3dBundle {
            transform: Transform::from_xyz(-3.0, 3.0, 5.0).looking_at(Vec3::ZERO, Vec3::Y),
            camera: Camera {
                order: 0,
                ..default()
            },
            ..default()
        });
    }
}