Recent updates to islandora module made PHP 7.2, PHP 7.1 stop ingesting and PHP 5.6 shows errors and even though it ingests, it fails to do any of the image regenerates.
The vanilla islandora vagrant has the same problem. Most of the errors are like this:
A non well formed numeric value encountered drush.inc:1661 [notice]
TypeError: Argument 6 passed to islandora_derivative_perform_batch_operation() must be of the type array, object given, called in /usr/share/drush/commands/core/drupal/batch.inc on line 163 in islandora_derivative_perform_batch_operation() (line 152 of /vhosts/digital/web/collections/sites/all/modules/islandora/includes/regenerate_derivatives.form.inc).