diff -u b/core/modules/responsive_image/src/Entity/ResponsiveImageMapping.php b/core/modules/responsive_image/src/Entity/ResponsiveImageMapping.php
--- b/core/modules/responsive_image/src/Entity/ResponsiveImageMapping.php
+++ b/core/modules/responsive_image/src/Entity/ResponsiveImageMapping.php
@@ -34,7 +34,8 @@
  *   },
  *   links = {
  *     "edit-form" = "entity.responsive_image_mapping.edit_form",
- *     "duplicate-form" = "entity.responsive_image_mapping.duplicate_form"
+ *     "duplicate-form" = "entity.responsive_image_mapping.duplicate_form",
+ *     "delete-form" = "entity.responsive_image_mapping.delete_form"
  *   }
  * )
  */
only in patch2:
unchanged:
--- a/core/modules/responsive_image/responsive_image.routing.yml
+++ b/core/modules/responsive_image/responsive_image.routing.yml
@@ -30,7 +30,7 @@ entity.responsive_image_mapping.duplicate_form:
   requirements:
     _permission: 'administer responsive images'
 
-responsive_image.mapping_action_confirm:
+entity.responsive_image_mapping.delete_form:
   path: '/admin/config/media/responsive-image-mapping/{responsive_image_mapping}/delete'
   defaults:
     _entity_form: 'responsive_image_mapping.delete'
only in patch2:
unchanged:
--- a/core/modules/responsive_image/src/ResponsiveImageMappingListBuilder.php
+++ b/core/modules/responsive_image/src/ResponsiveImageMappingListBuilder.php
@@ -38,10 +38,10 @@ public function buildRow(EntityInterface $entity) {
    */
   public function getDefaultOperations(EntityInterface $entity) {
     $operations = parent::getDefaultOperations($entity);
-    $operations['duplicate'] = array(
-      'title' => t('Duplicate'),
-      'weight' => 15,
-    ) + $entity->urlInfo('duplicate-form')->toArray();
+      $operations['duplicate'] = array(
+        'title' => t('Duplicate'),
+        'weight' => 15,
+      ) + $entity->urlInfo('duplicate-form')->toArray();
     return $operations;
   }