Navigation menu add sticky and latest posts as menu items

add_filter( 'wp_get_nav_menu_items', function( $items, $menu ) {

	// Settings
	$menu_name = 'MENU NAME HERE';
	$parent_title = 'PARENT MENU ITEM TITLE HERE';

	// Select Menu
	if( $menu->name != $menu_name ) {
		return $items;
	}

	// Loop Menu Items
	$menu_children = [];
	$menu_order = 0;
	foreach( $items as $i => $item ) {

		// Match Parent Item
		if( $item->post_title != $parent_title ) {
			if( $menu_order ) {
				$item->menu_order = ++ $menu_order;
			}
			continue;
		}
		$menu_order = $item->menu_order;

		// Query Sticky Posts
		$args = [
			'posts_per_page' => 10,
			'orderby' => 'date',
			'order' => 'DESC',
			'include' => implode( ',', get_option( 'sticky_posts' ) )
		];
		$posts = get_posts( $args );

		// Query Latest Posts
		$args = [
			'posts_per_page' => 10,
			'orderby' => 'date',
			'order' => 'DESC',
			'exclude' => implode( ',', get_option( 'sticky_posts' ) )
		];
		$posts = array_merge( $posts, get_posts( $args ) );

		// Pad To Ten
		$posts = array_slice( $posts, 0, 10 );

		// Loop Posts To Add
		foreach( $posts as $post ) {
			$post->menu_item_parent = $item->ID;
			$post->post_type = 'nav_menu_item';
			$post->object = 'custom';
			$post->type = 'custom';
			$post->menu_order = ++ $menu_order;
			$post->title = $post->post_title;
			$post->url = get_permalink( $post->ID );
			$post->target = '';
			$post->attr_title = '';
			$post->description = '';
			$post->classes = [];
			$post->xfn = '';
			$menu_children[] = $post;
		}
	}

	// Return New Menu
	return array_merge( $items, $menu_children );

}, 10, 2 );