AppExit doesn't close the app if called on startup

[jabuwu]

Bevy version

Present in 0.14.0-rc.2 and main (651f3d0)

Relevant system information

Only tried on MacOS, not sure about other platforms.

What you did

use bevy::{app::AppExit, prelude::*};

fn main() {
    App::new()
        .add_plugins(DefaultPlugins)
        .add_systems(Startup, startup)
        .run();
}

fn startup(mut app_exit: EventWriter<AppExit>) {
    app_exit.send(AppExit::Success);
}

What went wrong

The app hangs, unresponsive, and never closes.

Additional information

This also happens if in an Update system that runs on the first frame.

It was working correctly up until 13151. After this PR, the window still closes but with some error logs.

13236 fixed the error logs, but introduced this particular issue.

This use case probably seems crazy but I do rely on it for some example code.

[alice-i-cecile]

FYI @Brezak and @tychedelia

[tychedelia]

@jabuwu will you test #13744 to ensure it works for your more complicated example?

[jabuwu]

@jabuwu will you test #13744 to ensure it works for your more complicated example?

Works great! 😁 Thank you