hook_entity_create() is invoked after creating a new entity object

hook_entity_create() has been introduced to allow for altering the initial values of an entity object. The hook gets triggered by a call to entity_create(), thus it will run every time a new entity object is instantiated.

The hook may be used to populate default values or to provide initial values for the entity object in specific contexts:

<?php
/**
 * Implements hook_entity_create().
 */
function mymodule_entity_create(EntityInterface $entity) {
  // Customize the default value used for the entity title field.
  if (empty($entity->title->value)) {
    $entity->title->value = 'custom title';
  }
}
?>