can't show 2D and 3D models at the same time

[Frank-Buss]

Here is a simple example which demonstrate the problem:

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 { samples: 4 })
        .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_bundle(OrthographicCameraBundle::new_2d());
        commands.spawn_bundle(GeometryBuilder::build_as(
            &shape,
            DrawMode::Outlined {
                fill_mode: FillMode::color(Color::CYAN),
                outline_mode: StrokeMode::new(Color::BLACK, 10.0),
            },
            Transform::default(),
        ));
    }

    if SHOW_3D {
        // cube
        commands.spawn_bundle(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_bundle(PointLightBundle {
            transform: Transform::from_xyz(4.0, 8.0, 4.0),
            ..Default::default()
        });
        // camera
        commands.spawn_bundle(PerspectiveCameraBundle {
            transform: Transform::from_xyz(-3.0, 3.0, 5.0).looking_at(Vec3::ZERO, Vec3::Y),
            ..Default::default()
        });
    }
}

and the Cargo.toml file:

[package]
name = "bevytest"
version = "0.1.0"
edition = "2021"

[dependencies]
bevy = {version="0.6", default-features=true}
bevy_prototype_lyon = "0.4.0"

When I start it, it shows only the cube. But when I set SHOW_3D to false, it shows the 2D triangle. How can I show both? The triangle in the foreground.