diff --cc core/modules/taxonomy/taxonomy.module
index 72222aa,7efe333..0000000
--- a/core/modules/taxonomy/taxonomy.module
+++ b/core/modules/taxonomy/taxonomy.module
diff --git a/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/Field/FieldType/TaxonomyTermReferenceFieldItemList.php b/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/Field/FieldType/TaxonomyTermReferenceFieldItemList.php
index 096a452..53c5764 100644
--- a/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/Field/FieldType/TaxonomyTermReferenceFieldItemList.php
+++ b/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/Field/FieldType/TaxonomyTermReferenceFieldItemList.php
@@ -7,12 +7,12 @@
 
 namespace Drupal\taxonomy\Plugin\Field\FieldType;
 
-use Drupal\Core\Field\Plugin\Field\FieldType\LegacyConfigFieldItemList;
+use Drupal\Core\Field\ConfigFieldItemList;
 
 /**
- * Represents a configurable taxonomy_term_reference entity field.
+ * Represents a configurable taxonomy_term_reference entity field item list.
  */
-class TaxonomyTermReferenceFieldItemList extends LegacyConfigFieldItemList {
+class TaxonomyTermReferenceFieldItemList extends ConfigFieldItemList {
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/Field/FieldType/TaxonomyTermReferenceItem.php b/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/Field/FieldType/TaxonomyTermReferenceItem.php
index 3017245..3d186fc 100644
--- a/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/Field/FieldType/TaxonomyTermReferenceItem.php
+++ b/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/Field/FieldType/TaxonomyTermReferenceItem.php
@@ -34,7 +34,8 @@
  *   },
  *   instance_settings = { },
  *   default_widget = "options_select",
- *   default_formatter = "taxonomy_term_reference_link"
+ *   default_formatter = "taxonomy_term_reference_link",
+ *   list_class = "\Drupal\taxonomy\Plugin\Field\FieldType\TaxonomyTermReferenceFieldItemList"
  * )
  */
 class TaxonomyTermReferenceItem extends ConfigEntityReferenceItemBase implements ConfigFieldItemInterface, AllowedValuesInterface {