diff --git a/core/modules/node/tests/src/Functional/NodeTypePluralLabelsTranslationTest.php b/core/modules/node/tests/src/Functional/NodeTypePluralLabelsTranslationTest.php
index ed091b4..b369a4f 100644
--- a/core/modules/node/tests/src/Functional/NodeTypePluralLabelsTranslationTest.php
+++ b/core/modules/node/tests/src/Functional/NodeTypePluralLabelsTranslationTest.php
@@ -3,6 +3,7 @@
 namespace Drupal\Tests\node\Functional;
 
 use Drupal\Component\Gettext\PoHeader;
+use Drupal\Core\StringTranslation\PluralTranslatableMarkup;
 use Drupal\language\Entity\ConfigurableLanguage;
 use Drupal\node\Entity\NodeType;
 use Drupal\Tests\BrowserTestBase;
@@ -69,7 +70,7 @@ public function testNodeTypeTranslation() {
 
     $this->drupalGet('admin/structure/types/add');
 
-    // Romanian language has 3 plural variants
+    // Check that 3 plural variants are exposed for the Romanian language.
     $this->assertSession()->fieldExists('label_count[0]');
     $this->assertSession()->fieldExists('label_count[1]');
     $this->assertSession()->fieldExists('label_count[2]');
@@ -98,7 +99,7 @@ public function testNodeTypeTranslation() {
     /** @var \Drupal\node\Entity\NodeType $node_type */
     $node_type = NodeType::load('child');
 
-    // Test the default language (Romanian) original labels.
+    // Check that the default language (Romanian) original labels were stored.
     self::assertEquals($node_type->label(), 'Copil');
     self::assertEquals($node_type->getSingularLabel(), 'copil');
     self::assertEquals($node_type->getPluralLabel(), 'copii');
@@ -113,13 +114,25 @@ public function testNodeTypeTranslation() {
     $node_type = NodeType::load('child');
     $language_manager->setConfigOverrideLanguage($original_language);
 
-    // Test the additional language (English) translated labels.
+    // Check that the English translated labels were stored.
     self::assertEquals($node_type->label(), 'Child');
     self::assertEquals($node_type->getSingularLabel(), 'child');
     self::assertEquals($node_type->getPluralLabel(), 'children');
     self::assertEquals($node_type->getCountLabel(1), '1 child');
     self::assertEquals($node_type->getCountLabel(5), '5 children');
     self::assertEquals($node_type->getCountLabel(20), '20 children');
+
+    // Clear the count label second variant to test variant delta preserving.
+    $edit = ['label_count[1]' => ''];
+    $this->drupalPostForm($node_type->urlInfo('edit-form'), $edit, t('Save content type'));
+
+    $node_type = NodeType::load('child');
+
+    // Check that the variants delta has been preserved.
+    $variants = explode(PluralTranslatableMarkup::DELIMITER, $node_type->get('label_count'));
+    self::assertEquals($variants[0], '1 copil');
+    self::assertEquals($variants[1], '');
+    self::assertEquals($variants[2], '@count de copii');
   }
 
 }