function bp_activity_post_type_update( $post = null ) {

	if ( ! is_a( $post, 'WP_Post' ) ) {
		return;
	}

	// Get the post type tracking args.
	$activity_post_object = bp_activity_get_post_type_tracking_args( $post->post_type );

	if ( empty( $activity_post_object->action_id ) ) {
		return;
	}

	$activity_id = bp_activity_get_activity_id( array(
		'component'         => $activity_post_object->component_id,
		'item_id'           => get_current_blog_id(),
		'secondary_item_id' => $post->ID,
		'type'              => $activity_post_object->action_id,
	) );

	// Activity ID doesn't exist, so stop!
	if ( empty( $activity_id ) ) {
		return;
	}

	// Delete the activity if the post was updated with a password.
	if ( ! empty( $post->post_password ) ) {
		bp_activity_delete( array( 'id' => $activity_id ) );
	}

	// Update the activity entry.
	$activity = new BP_Activity_Activity( $activity_id );

	if ( ! empty( $post->post_content ) ) {
		$activity_summary = bp_activity_create_summary( $post->post_content, (array) $activity );

		// Backward compatibility filter for the blogs component.
		if ( 'blogs' == $activity_post_object->component_id ) {
			$activity->content = apply_filters( 'bp_blogs_record_activity_content', $activity_summary, $post->post_content, (array) $activity, $post->post_type );
		} else {
			$activity->content = $activity_summary;
		}
	}

	// Save the updated activity.
	$updated = $activity->save();

	/**
	 * Fires after the updating of an activity item for a custom post type entry.
	 *
	 * @since 2.2.0
	 * @since 2.5.0 Add the post type tracking args parameter
	 *
	 * @param WP_Post              $post                 Post object.
	 * @param BP_Activity_Activity $activity             Activity object.
	 * @param object               $activity_post_object The post type tracking args object.
	 */
	do_action( 'bp_activity_post_type_updated', $post, $activity, $activity_post_object );

	return $updated;
}