Alec Smrekar
--- a/core/modules/menu_ui/tests/src/Functional/MenuUiMenuLinkTranslationTest.php 0 → 100644
+++ b/core/modules/menu_ui/tests/src/Functional/MenuUiMenuLinkTranslationTest.php 0 → 100644
+    // Enable translation for page nodes.
+    $this->enableContentTranslation('node', 'page');
+  }
+
+  /**
+   * Gets a content entity object by title.
+   *
+   * @param string $entity_type_id
+   *   Id of content entity type of content entity to load.
+   * @param string $title
+   *   Title of content entity to load.
+   *
+   * @return \Drupal\Core\Entity\ContentEntityInterface
+   *   First found content entity with given title.
+   */
+  protected function getContentEntityByTitle($entity_type_id, $title) {
-  protected function getContentEntityByTitle($entity_type_id, $title) {
+  protected function getContentEntityByTitle(string $entity_type_id, string $title): ContentEntityInterface {
--- a/core/modules/menu_ui/tests/src/Functional/MenuUiContentTranslationTest.php
+++ b/core/modules/menu_ui/tests/src/Functional/MenuUiContentTranslationTest.php

    // Enable translation for page nodes and menu link content.
    static::enableBundleTranslation('node', 'page');
+    \Drupal::service('content_translation.manager')
--- a/core/modules/menu_ui/menu_ui.module
+++ b/core/modules/menu_ui/menu_ui.module
  /** @var \Drupal\menu_link_content\MenuLinkContentInterface $entity */
  if (!empty($values['entity_id'])) {
    $entity = MenuLinkContent::load($values['entity_id']);
+    assert($entity instanceof TranslatableInterface);
--- a/core/modules/menu_ui/menu_ui.module
+++ b/core/modules/menu_ui/menu_ui.module
        $entity = $entity->getTranslation($node->language()->getId());
      }
    }
-    else {
+    elseif ($entity->isTranslatable()) {