wp_insert_post_data empty post_title

Hi, I need to create posts with automatic title.
I found this solution:

add_filter( 'wp_insert_post_data', 'wpse_update_post_title_and_slug' );
function wpse_update_post_title_and_slug( $data ) {
    if( 'estate_property' == $data['post_type'] ) {
        //Add post meta to post title
        $data['post_title'] = 'E'.$_POST['ID'];
    }
    return $data;
}

When I create a post, the post title is automatically generated and is displayed in the title field.
But when I check the database, in wp_posts table the post_title field is correctly filled , but in wp_postmeta table the post_title field appears empty.
Any idea why?