diff -u b/core/modules/migrate_drupal_ui/tests/src/Functional/d6/Rollback6Test.php b/core/modules/migrate_drupal_ui/tests/src/Functional/d6/Rollback6Test.php
--- b/core/modules/migrate_drupal_ui/tests/src/Functional/d6/Rollback6Test.php
+++ b/core/modules/migrate_drupal_ui/tests/src/Functional/d6/Rollback6Test.php
@@ -61,7 +61,7 @@
       'block' => 32,
       'block_content' => 2,
       'block_content_type' => 1,
-      'comment' => 0,
+      'comment' => 8,
       'comment_type' => 14,
       'configurable_language' => 5,
       'contact_form' => 5,