diff --git a/src/Form/UpdateReady.php b/src/Form/UpdateReady.php
index fab06f14e1e9c1bdd9a855316422389ce5c0b6ed..2923d72ce18791d016067a63ee5ef0913dbd7a80 100644
--- a/src/Form/UpdateReady.php
+++ b/src/Form/UpdateReady.php
@@ -5,6 +5,7 @@ namespace Drupal\automatic_updates\Form;
 use Drupal\automatic_updates\BatchProcessor;
 use Drupal\automatic_updates\Updater;
 use Drupal\automatic_updates\Validation\ReadinessTrait;
+use Drupal\package_manager\ValidationResult;
 use Drupal\package_manager\Validator\StagedDBUpdateValidator;
 use Drupal\Core\Batch\BatchBuilder;
 use Drupal\Core\Extension\ModuleExtensionList;
@@ -29,7 +30,9 @@ use Symfony\Component\EventDispatcher\EventDispatcherInterface;
  */
 final class UpdateReady extends FormBase {
 
-  use ReadinessTrait;
+  use ReadinessTrait {
+    formatResult as traitFormatResult;
+  }
 
   /**
    * The updater service.
@@ -274,4 +277,22 @@ final class UpdateReady extends FormBase {
     }
   }
 
+  /**
+   * {@inheritdoc}
+   *
+   * @todo Remove this in https://www.drupal.org/project/automatic_updates/issues/3313414.
+   */
+  protected function formatResult(ValidationResult $result) {
+    $messages = $result->getMessages();
+
+    if (count($messages) > 1) {
+      return [
+        '#theme' => 'item_list__automatic_updates_validation_results',
+        '#prefix' => $result->getSummary(),
+        '#items' => $messages,
+      ];
+    }
+    return $this->traitFormatResult($result);
+  }
+
 }
diff --git a/tests/src/Functional/UpdaterFormTest.php b/tests/src/Functional/UpdaterFormTest.php
index db866a7bf8951892bd20af66a324f098eb572e2a..4548dd4071462fc28edd4bdd1191ad02bd60529a 100644
--- a/tests/src/Functional/UpdaterFormTest.php
+++ b/tests/src/Functional/UpdaterFormTest.php
@@ -774,9 +774,20 @@ class UpdaterFormTest extends AutomaticUpdatesFunctionalTestBase {
     $page->pressButton('Update to 9.8.1');
     $this->checkForMetaRefresh();
     $this->assertUpdateStagedTimes(1);
-    $error = ValidationResult::createError(['Error occured.']);
+
+    $error_messages = [
+      "The only thing we're allowed to do is to",
+      "believe that we won't regret the choice",
+      "we made.",
+    ];
+    $summary = t('some generic summary');
+    $error = ValidationResult::createError($error_messages, $summary);
     TestSubscriber::setTestResult([$error], StatusCheckEvent::class);
     $this->getSession()->reload();
+    $assert_session->pageTextContains($summary);
+    foreach ($error_messages as $message) {
+      $assert_session->pageTextContains($message);
+    }
     $assert_session->buttonNotExists('Continue');
     $assert_session->buttonExists('Cancel update');
   }
@@ -794,13 +805,22 @@ class UpdaterFormTest extends AutomaticUpdatesFunctionalTestBase {
     $this->checkForMetaRefresh();
     $this->assertUpdateStagedTimes(1);
 
-    $warning = ValidationResult::createWarning(['Some warning.']);
+    $messages = [
+      "The only thing we're allowed to do is to",
+      "believe that we won't regret the choice",
+      "we made.",
+    ];
+    $summary = t('some generic summary');
+    $warning = ValidationResult::createWarning($messages, $summary);
     TestSubscriber::setTestResult([$warning], StatusCheckEvent::class);
     $session->reload();
 
     $assert_session = $this->assertSession();
     $assert_session->buttonExists('Continue');
-    $assert_session->pageTextContains('Some warning.');
+    $assert_session->pageTextContains($summary);
+    foreach ($messages as $message) {
+      $assert_session->pageTextContains($message);
+    }
   }
 
   /**