backend_qgui not enabled?

[sclynes]

bevy_mod_picking is under dependencies like this

[dependencies]
bevy = { version = "0.12.1", features = ["dynamic_linking"] }
bevy_diagnostic = "0.12.1"
bevy_screen_diagnostics = "0.4.0"
bevy_mod_picking = {version="0.17.0", features=["backend_egui"]}
bevy_egui = "0.24.0"
byteorder = "1.5.0"
lerp = "0.5.0"

when I run the following code, there is no gui

impl Plugin for GuiPlugin {
    fn build(&self, app: &mut App) {
       #[cfg(feature = "backend_egui")]
        app
        .add_plugins(EguiPlugin)
        .add_systems(Update, ui_example_system);
    }
}

Anyone know where I'm going wrong here?