Updated to Drupal 8.6.4, which is PHP 7.3 friendly. Also updated HTMLaw library....

[yaffs-website] / web / core / modules / block_content / config / install / core.entity_view_mode.block_content.full.yml

langcode: en
status: false
dependencies:
  module:
    - block_content
id: block_content.full
label: Full
targetEntityType: block_content
cache: true