Required components behave unexpectedly for UI

[Shatur]

Bevy version

v0.16.0-rc.3

What you did

use bevy::{input::common_conditions::*, prelude::*};

fn main() {
    App::new()
        .add_plugins(DefaultPlugins)
        .insert_resource(ClearColor(Color::srgb(0.9, 0.9, 0.9)))
        .add_systems(Startup, setup)
        .add_systems(Update, show.run_if(input_just_pressed(KeyCode::Space)))
        .run();
}

fn setup(mut commands: Commands) {
    commands.spawn(Camera2d);

    commands.spawn((
        Node {
            width: Val::Percent(100.0),
            height: Val::Percent(100.0),
            ..Default::default()
        },
        // Yes, all this hierarchy nodes are required to trigger the issue.
        children![(Node::default(), children![Node::default()])],
    ));
}

fn show(mut commands: Commands, root_entity: Single<Entity, (With<Node>, Without<ChildOf>)>) {
    info!("showing dialog");

    commands.spawn((
        ChildOf {
            parent: *root_entity,
        },
        Node {
            width: Val::Percent(100.0),
            height: Val::Percent(100.0),
            align_items: AlignItems::Center,
            justify_content: JustifyContent::Center,
            ..Default::default()
        },
        BackgroundColor(Color::BLACK),
        // Uncommend this `Dialog` component and the text won't be displayed.
        // Dialog,
        children![(
            Node::default(),
            children![Text::new("This text should be displayed")]
        )],
    ));
}

#[derive(Component, Default)]
#[require(
    Node {
        width: Val::Percent(100.0),
        height: Val::Percent(100.0),
        align_items: AlignItems::Center,
        justify_content: JustifyContent::Center,
        ..Default::default()
    },
    BackgroundColor(Color::BLACK),
)]
struct Dialog;

What went wrong

With very specific hierarchy setups (see code comments), using required components sometimes behaves differently from inserting the necessary components directly. If you uncomment Dialog insertion, the text won't be displayed.

[Shatur]

Can't reproduce on main, closing 🙂