The inbox shortcode on the front page displays posts instead of the workflow detail

/**
 * Fix front page issue; Gravity PDF registers the lid query var causing posts to be displayed instead of the detail page.
 *
 * @param WP_Query $query The WP_Query instance (passed by reference).
 */
function gravity_flow_action_pre_get_posts( $query ) {
	if ( ! $query->is_main_query() || ! function_exists( 'gravity_flow' ) || is_admin() ) {
		return;
	}
	
	if ( $query->get( 'lid' ) && gravity_flow()->is_workflow_detail_page() && get_option( 'show_on_front' ) == 'page' ) {
		$page_id = get_option( 'page_on_front' );
		$page    = get_post( $page_id );

		if ( stripos( $page->post_content, '[gravityflow' ) !== false ) {
			gravity_flow()->log_debug( __METHOD__ . '(): fixing front page lid issue.' );

			$query->set( 'page_id', $page_id );
			$query->is_page        = true;
			$query->queried_object = $page;
		}
	}
}
add_action( 'pre_get_posts', 'gravity_flow_action_pre_get_posts' );