hook_translation_create is not invoked with the new entity translation but with the previous entity object

Problem/Motivation

ContentEntityStorageBase::createTranslation fires two hooks when a new translation is created: hook_field_values_init and hook_translation_create. hook_field_values_init is invoked with the new entity translation object, but the hook_translation_create is invoked with the previous entity object. Both hooks have been introduced in #2382675: hook_entity_create() affects the data of new translations of existing entities in unexpected and undocumented ways.

The entity API states that the new entity translation is passed, but it is not:

/**
 * Acts when creating a new entity translation.
 *
 * This hook runs after a new entity translation object has just been
 * instantiated.
 *
 * @param \Drupal\Core\Entity\EntityInterface $translation
 *   The entity object.
 *
 * @ingroup entity_crud
 * @see hook_ENTITY_TYPE_translation_create()
 */
function hook_entity_translation_create(\Drupal\Core\Entity\EntityInterface $translation) {
  \Drupal::logger('example')->info('Entity translation created: @label', ['@label' => $translation->label()]);
}

Proposed resolution

Call the hook_translation_create with the new entity translation object.

Remaining tasks

none

User interface changes

none

API changes

none

Data model changes

none