Since updating to 8.6, the drush installer fails activating default content and importing page content:
In ContentEntityNormalizer.php line 235:
[Symfony\Component\Serializer\Exception\UnexpectedValueException]
Type http://drupal.org/rest/type/node/page does not correspond to an entity on this site.
Since updating to 8.6, the drush installer fails activating default content and importing page content: