diff -u b/core/modules/migrate_drupal/tests/fixtures/drupal6.php b/core/modules/migrate_drupal/tests/fixtures/drupal6.php
--- b/core/modules/migrate_drupal/tests/fixtures/drupal6.php
+++ b/core/modules/migrate_drupal/tests/fixtures/drupal6.php
@@ -8464,23 +8464,6 @@
   'mysql_character_set' => 'utf8',
 ));
 
-$connection->insert('i18n_blocks')
-->fields(array(
-  'ibid',
-  'module',
-  'delta',
-  'type',
-  'language',
-))
-->values(array(
-  'ibid' => '1',
-  'module' => 'user',
-  'delta' => '1',
-  'type' => '0',
-  'language' => 'zu',
-))
-->execute();
-
 $connection->schema()->createTable('i18n_strings', array(
   'fields' => array(
     'lid' => array(
@@ -8547,6 +8530,23 @@
   'mysql_character_set' => 'utf8',
 ));
 
+$connection->insert('i18n_blocks')
+->fields(array(
+  'ibid',
+  'module',
+  'delta',
+  'type',
+  'language',
+))
+->values(array(
+  'ibid' => '1',
+  'module' => 'user',
+  'delta' => '1',
+  'type' => '0',
+  'language' => 'zu',
+))
+->execute();
+
 $connection->schema()->createTable('i18n_strings', array(
   'fields' => array(
     'lid' => array(
reverted:
--- b/core/modules/migrate_drupal_ui/src/Form/MigrateUpgradeForm.php
+++ a/core/modules/migrate_drupal_ui/src/Form/MigrateUpgradeForm.php
@@ -66,10 +66,6 @@
       'source_module' => 'block',
       'destination_module' => 'block',
     ],
-    'd6_block_translation' => [
-      'source_module' => 'i18n',
-      'destination_module' => 'content_translation',
-    ],
     'd7_block' => [
       'source_module' => 'block',
       'destination_module' => 'block',
@@ -94,10 +90,6 @@
       'source_module' => 'block',
       'destination_module' => 'block_content',
     ],
-    'd6_custom_block_translation' => [
-      'source_module' => 'i18n',
-      'destination_module' => 'content_translation',
-    ],
     'd7_custom_block' => [
       'source_module' => 'block',
       'destination_module' => 'block_content',