diff -u b/core/modules/migrate_drupal_ui/src/Form/MigrateUpgradeForm.php b/core/modules/migrate_drupal_ui/src/Form/MigrateUpgradeForm.php
--- b/core/modules/migrate_drupal_ui/src/Form/MigrateUpgradeForm.php
+++ b/core/modules/migrate_drupal_ui/src/Form/MigrateUpgradeForm.php
@@ -490,10 +490,6 @@
       'source_module' => 'taxonomy',
       'destination_module' => 'taxonomy',
     ],
-    'd6_i18n_taxonomy_vocabulary' => [
-      'source_module' => 'taxonomy',
-      'destination_module' => 'taxonomy',
-    ],
     'd6_term_node' => [
       'source_module' => 'taxonomy',
       'destination_module' => 'taxonomy',
@@ -502,6 +498,10 @@
       'source_module' => 'taxonomy',
       'destination_module' => 'taxonomy',
     ],
+    'd6_i18n_taxonomy_vocabulary' => [
+      'source_module' => 'taxonomy',
+      'destination_module' => 'taxonomy',
+    ],
     'd6_term_node' => [
       'source_module' => 'taxonomy',
       'destination_module' => 'taxonomy',
reverted:
--- b/core/modules/taxonomy/tests/src/Kernel/Plugin/migrate/d6/I18nVocabularyTest.php
+++ /dev/null
@@ -1,131 +0,0 @@
-<?php
-
-namespace Drupal\Tests\taxonomy\Kernel\Plugin\migrate\source\d6;
-
-use Drupal\Tests\migrate\Kernel\MigrateSqlSourceTestBase;
-
-/**
- * Tests D6 i18n vocabulary source plugin.
- *
- * @covers \Drupal\taxonomy\Plugin\migrate\source\d6\I18nTaxonomyVocabulary
- * @group taxonomy
- */
-class I18nVocabularyTest extends MigrateSqlSourceTestBase {
-
-  /**
-   * {@inheritdoc}
-   */
-  public static $modules = ['taxonomy', 'migrate_drupal'];
-
-  protected $i18n_strings = [
-    [
-      'lid' => 1,
-      'objectid' => 1,
-      'type' => 'vocabulary',
-      'property' => 'name',
-      'objectindex' => 1,
-      'format' => 0,
-    ],
-    [
-      'lid' => 2,
-      'objectid' => 2,
-      'type' => 'vocabulary',
-      'property' => 'name',
-      'objectindex' => 2,
-      'format' => 0,
-    ],
-  ];
-
-  protected $locales_target = [
-    [
-      'lid' => 1,
-      'language' => 'fr',
-      'translation' => 'fr - vocabulary 1',
-      'plid' => 0,
-      'plural' => 0,
-      'i18n_status' => 0,
-    ],
-    [
-      'lid' => 2,
-      'language' => 'fr',
-      'translation' => 'fr - vocabulary 2',
-      'plid' => 0,
-      'plural' => 0,
-      'i18n_status' => 0,
-    ],
-  ];
-
-  protected $vocabulary = [
-    [
-      'vid' => 1,
-      'name' => 'vocabulary 1',
-      'description' => 'description of vocabulary 1',
-      'help' => 1,
-      'relations' => 1,
-      'hierarchy' => 1,
-      'multiple' => 0,
-      'required' => 0,
-      'tags' => 0,
-      'module' => 'taxonomy',
-      'weight' => 4,
-      'language' => ''
-    ],
-    [
-      'vid' => 2,
-      'name' => 'vocabulary 2',
-      'description' => 'description of vocabulary 2',
-      'help' => 1,
-      'relations' => 1,
-      'hierarchy' => 1,
-      'multiple' => 0,
-      'required' => 0,
-      'tags' => 0,
-      'module' => 'taxonomy',
-      'weight' => 5,
-      'language' => ''
-    ],
-  ];
-
-  protected $expectedResults = [
-    [
-      'vid' => 1,
-      'name' => 'vocabulary 1',
-      'description' => 'description of vocabulary 1',
-      'lid' => '1',
-      'type' => 'vocabulary',
-      'property' => 'name',
-      'objectid'=> '1',
-      'lt_lid' => '1',
-      'translation' => 'fr - vocabulary 1',
-      'language' => 'fr',
-    ],
-    [
-      'vid' => 2,
-      'name' => 'vocabulary 2',
-      'description' => 'description of vocabulary 2',
-      'lid' => '2',
-      'type' => 'vocabulary',
-      'property' => 'name',
-      'objectid'=> '2',
-      'lt_lid' => '2',
-      'translation' => 'fr - vocabulary 2',
-      'language' => 'fr',
-    ],
-  ];
-
-  /**
-   * {@inheritdoc}
-   */
-  public function providerSource() {
-    $tests = [];
-
-    $tests[0][0]['i18n_strings'] = $this->i18n_strings;
-    $tests[0][0]['locales_target'] = $this->locales_target;
-    $tests[0][0]['vocabulary'] = $this->vocabulary;
-
-    $tests[0][1] = $this->expectedResults;
-
-    return $tests;
-  }
-
-}
only in patch2:
unchanged:
--- /dev/null
+++ b/core/modules/taxonomy/tests/src/Kernel/Plugin/migrate/source/d6/I18nVocabularyTest.php
@@ -0,0 +1,131 @@
+<?php
+
+namespace Drupal\Tests\taxonomy\Kernel\Plugin\migrate\source\d6;
+
+use Drupal\Tests\migrate\Kernel\MigrateSqlSourceTestBase;
+
+/**
+ * Tests D6 i18n vocabulary source plugin.
+ *
+ * @covers \Drupal\taxonomy\Plugin\migrate\source\d6\I18nTaxonomyVocabulary
+ * @group taxonomy
+ */
+class I18nVocabularyTest extends MigrateSqlSourceTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['taxonomy', 'migrate_drupal'];
+
+  protected $i18n_strings = [
+    [
+      'lid' => 1,
+      'objectid' => 1,
+      'type' => 'vocabulary',
+      'property' => 'name',
+      'objectindex' => 1,
+      'format' => 0,
+    ],
+    [
+      'lid' => 2,
+      'objectid' => 2,
+      'type' => 'vocabulary',
+      'property' => 'name',
+      'objectindex' => 2,
+      'format' => 0,
+    ],
+  ];
+
+  protected $locales_target = [
+    [
+      'lid' => 1,
+      'language' => 'fr',
+      'translation' => 'fr - vocabulary 1',
+      'plid' => 0,
+      'plural' => 0,
+      'i18n_status' => 0,
+    ],
+    [
+      'lid' => 2,
+      'language' => 'fr',
+      'translation' => 'fr - vocabulary 2',
+      'plid' => 0,
+      'plural' => 0,
+      'i18n_status' => 0,
+    ],
+  ];
+
+  protected $vocabulary = [
+    [
+      'vid' => 1,
+      'name' => 'vocabulary 1',
+      'description' => 'description of vocabulary 1',
+      'help' => 1,
+      'relations' => 1,
+      'hierarchy' => 1,
+      'multiple' => 0,
+      'required' => 0,
+      'tags' => 0,
+      'module' => 'taxonomy',
+      'weight' => 4,
+      'language' => ''
+    ],
+    [
+      'vid' => 2,
+      'name' => 'vocabulary 2',
+      'description' => 'description of vocabulary 2',
+      'help' => 1,
+      'relations' => 1,
+      'hierarchy' => 1,
+      'multiple' => 0,
+      'required' => 0,
+      'tags' => 0,
+      'module' => 'taxonomy',
+      'weight' => 5,
+      'language' => ''
+    ],
+  ];
+
+  protected $expectedResults = [
+    [
+      'vid' => 1,
+      'name' => 'vocabulary 1',
+      'description' => 'description of vocabulary 1',
+      'lid' => '1',
+      'type' => 'vocabulary',
+      'property' => 'name',
+      'objectid'=> '1',
+      'lt_lid' => '1',
+      'translation' => 'fr - vocabulary 1',
+      'language' => 'fr',
+    ],
+    [
+      'vid' => 2,
+      'name' => 'vocabulary 2',
+      'description' => 'description of vocabulary 2',
+      'lid' => '2',
+      'type' => 'vocabulary',
+      'property' => 'name',
+      'objectid'=> '2',
+      'lt_lid' => '2',
+      'translation' => 'fr - vocabulary 2',
+      'language' => 'fr',
+    ],
+  ];
+
+  /**
+   * {@inheritdoc}
+   */
+  public function providerSource() {
+    $tests = [];
+
+    $tests[0][0]['i18n_strings'] = $this->i18n_strings;
+    $tests[0][0]['locales_target'] = $this->locales_target;
+    $tests[0][0]['vocabulary'] = $this->vocabulary;
+
+    $tests[0][1] = $this->expectedResults;
+
+    return $tests;
+  }
+
+}