Patched to Drupal 8.4.8 level. See https://www.drupal.org/sa-core-2018-004 and patch...

[yaffs-website] / web / core / modules / layout_discovery / layout_discovery.services.yml

services:
  plugin.manager.core.layout:
    class: Drupal\Core\Layout\LayoutPluginManager
    arguments: ['@container.namespaces', '@cache.discovery', '@module_handler', '@theme_handler']