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

[yaffs-website] / web / core / profiles / standard / config / optional / image.style.max_2600x2600.yml

name: max_2600x2600
label: 'Max 2600x2600'
effects:
  9b311dd1-0351-45a1-9500-cd069e4670cb:
    id: image_scale
    data:
      width: 2600
      height: 2600
      upscale: false
    weight: 3
    uuid: 9b311dd1-0351-45a1-9500-cd069e4670cb
langcode: en
dependencies:
  module:
    - responsive_image
  enforced:
    module:
      - responsive_image