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

[yaffs-website] / web / core / modules / block_place / block_place.info.yml

name: Place Blocks
type: module
description: 'Allow administrators to place blocks from any Drupal page'
package: Core (Experimental)
version: VERSION
core: 8.x
hidden: true
dependencies:
  - drupal:block