diff -u b/core/lib/Drupal/Core/Entity/ContentEntityStorageBase.php b/core/lib/Drupal/Core/Entity/ContentEntityStorageBase.php
--- b/core/lib/Drupal/Core/Entity/ContentEntityStorageBase.php
+++ b/core/lib/Drupal/Core/Entity/ContentEntityStorageBase.php
@@ -405,7 +405,12 @@
     $args = array_slice(func_get_args(), 2);
     foreach (array_keys($entity->getTranslationLanguages()) as $langcode) {
       $translation = $entity->getTranslation($langcode);
-      foreach ($this->getFieldsToInvoke($translation) as $name => $items) {
+      // For non translatable fields, there is only one field object instance
+      // across all translations and it has as parent entity the entity in the
+      // default entity translation. Therefore field methods on non translatable
+      // fields should be invoked only on the default entity translation.
+      $fields = $translation->isDefaultTranslation() ? $translation->getFields() : $translation->getTranslatableFields();
+      foreach ($fields as $name => $items) {
         // call_user_func_array() is way slower than a direct call so we avoid
         // using it if have no parameters.
         $result[$langcode][$name] = $args ? call_user_func_array([$items, $method], $args) : $items->{$method}();
@@ -415,33 +420,6 @@
   }
 
   /**
-   * Gets fields based on the entity translation, to invoke methods on them.
-   *
-   * For non translatable fields, we have only one field object instance across
-   * all translations and it has as parent entity the entity in the default
-   * entity translation. Therefore field methods on non translatable fields
-   * should be invoked only on the default entity translation. The method
-   * returns for a default entity translation all the fields and for all other
-   * translations only the translatable fields.
-   *
-   * @param \Drupal\Core\Entity\ContentEntityInterface $entity
-   *   The entity object.
-   *
-   * @return \Drupal\Core\Field\FieldItemListInterface[]
-   *   An array of field item lists implementing, keyed by field name.
-   */
-  protected function getFieldsToInvoke(ContentEntityInterface $entity) {
-    if ($entity->isDefaultTranslation()) {
-      $fields = $entity->getFields();
-    }
-    else {
-      $fields = $entity->getTranslatableFields();
-    }
-
-    return $fields;
-  }
-
-  /**
    * Invokes the post save method on the Field objects within an entity.
    *
    * @param \Drupal\Core\Entity\ContentEntityInterface $entity