* @since 5.9.0

 * @since 6.3.0 Backwards compatibility: blocks with no `syncStatus` attribute do not receive block wrapper.

 *

 * @global WP_Embed $wp_embed Used to process embedded content within patterns

 *

	static $seen_refs = array();

	if ( isset( $seen_refs[ $attributes['slug'] ] ) ) {

		// WP_DEBUG_DISPLAY must only be honored when WP_DEBUG. This precedent

		// is set in `wp_debug_mode()`.

		$is_debug = WP_DEBUG && WP_DEBUG_DISPLAY;

		return $is_debug ?

			// translators: Visible only in the front end, this warning takes the place of a faulty block. %s represents a pattern's slug.

			sprintf( __( '[block rendering halted for pattern "%s"]' ), $slug ) :

			'';

	}

	$content = $pattern['content'];

	// Backward compatibility for handling Block Hooks and injecting the theme attribute in the Gutenberg plugin.

	// This can be removed when the minimum supported WordPress is >= 6.4.

	if ( defined( 'IS_GUTENBERG_PLUGIN' ) && IS_GUTENBERG_PLUGIN && ! function_exists( 'traverse_and_serialize_blocks' ) ) {

		$blocks  = parse_blocks( $content );

		$content = gutenberg_serialize_blocks( $blocks );

	}

	$seen_refs[ $attributes['slug'] ] = true;

	$content = do_blocks( $content );

	global $wp_embed;

	$content = $wp_embed->autoembed( $content );

	unset( $seen_refs[ $attributes['slug'] ] );

	return $content;