Update to Drupal 8.0.0-beta15. For more information, see: https://www.drupal.org/node/2563023

core/modules/node/config/optional/views.view.glossary.yml

@@ -172,8 +172,12 @@ display:
           table: node_field_data
           field: changed
           label: 'Last update'
-          date_format: long
-          plugin_id: date
+          type: timestamp
+          settings:
+            date_format: long
+            custom_date_format: ''
+            timezone: ''
+          plugin_id: field
           relationship: none
           group_type: group
           admin_label: ''
@@ -217,8 +221,6 @@ display:
           hide_empty: false
           empty_zero: false
           hide_alter_empty: true
-          custom_date_format: ''
-          timezone: ''
           entity_type: node
           entity_field: changed
       arguments: