Gizmos do not show from a triggered system

[cark]

Bevy version

• bevy 0.14
• current commit (at time of posting) bevy = { git = "https://github.com/bevyengine/bevy.git", rev = "0685d2d" }

[Optional] Relevant system information

• window 10
• cargo 1.79.0 (ffa9cf99a 2024-06-03)

AdapterInfo { name: "NVIDIA GeForce GTX 1080", vendor: 4318, device: 7040, device_type: DiscreteGpu, driver: "NVIDIA", driver_info: "551.86", backend: Vulkan }

What you did

I can display gizmos just fine, but when I do it from a system that was triggered by app.observe, it silently fails.

Minimal example:

use bevy::{
    color::palettes::css::{BLUE, RED},
    prelude::*,
};

fn main() {
    App::new()
        .add_plugins(DefaultPlugins)
        .add_systems(Startup, init_camera)
        // drawing a blue gizmo works as expected
        .add_systems(Update, regular_gizmo)
        // we trigger the DrawRedGizmo event on each frame
        .add_systems(Update, trigger_red_gizmo)
        // we try to draw a gizmo from this callback
        .observe(on_red_gizmo_triggered)
        .run();
}

#[derive(Event)]
struct DrawRedGizmo;

fn init_camera(mut cmd: Commands) {
    cmd.spawn(Camera2dBundle::default());
}

fn regular_gizmo(mut gizmos: Gizmos) {
    gizmos.circle_2d(Vec2::new(-50.0, 0.0), 40.0, BLUE);
}

fn trigger_red_gizmo(mut cmd: Commands) {
    cmd.trigger(DrawRedGizmo);
}

fn on_red_gizmo_triggered(_trigger: Trigger<DrawRedGizmo>, mut gizmos: Gizmos) {
    // that gizmo isn't shown.
    gizmos.circle_2d(Vec2::new(50.0, 0.0), 40.0, RED);
}

You can check the repository I made there:
https://github.com/cark/bevy-gizmo-bug

It contains a branch for bevy 0.14 and one for the current (at time of this post) bevy commit.

What went wrong

• what were you expecting?
  • I was expecting to see a red and a blue gizmo
• what actually happened?
  • only the blue gizmo was visible

[alice-i-cecile]

Probably the same root cause as #19569.