Updated Drupal to 8.6. This goes with the following updates because it's possible...

[yaffs-website] / web / core / modules / node / config / install / system.action.node_save_action.yml

langcode: en
status: true
dependencies:
  module:
    - node
id: node_save_action
label: 'Save content'
type: node
plugin: entity:save_action:node
configuration: {  }