bevy_aseprite_ultra

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I might just be too much of a noob with Bevy to understand what I'm doing wrong here, but the following only draws one sprite; all other sprites are just a single white pixel.

fn setup() {
	let mut rng = rand::thread_rng();
	for _ in 0..10 {
		commands.spawn((
			// . . .
			AseSpriteAnimation {
				animation: Animation::tag("scuttle"),
				aseprite: asset_server.load("crab.aseprite"),
			},
			ManualTick,
		));
	}
}


fn move_crabs(
	mut commands: Commands,
	mut crab_query: Query<
		(&mut Crab, &mut Position, &mut Direction, Entity),
		With<AseSpriteAnimation>,
	>,
	time: Res<Time>,
) {
	for (mut crab, mut pos, mut dir, entity) in crab_query.iter_mut() {
		let current_time = time.elapsed().as_millis() as u64;
		if current_time >= crab.next_walk_at {
			crab.next_walk_at = current_time.wrapping_add(crab.walk_interval);
			let (x_offset, y_offset) = dir.to_offset_with_scale(crab.walk_distance);
			pos.x += x_offset;
			pos.y += y_offset;
			commands.trigger_targets(NextFrameEvent, entity);
		}
	}
}

Am I misunderstanding something about Bevy or misusing this library somehow?