diff --git a/core/modules/system/tests/modules/error_service_test/src/MonkeysInTheControlRoom.php b/core/modules/system/tests/modules/error_service_test/src/MonkeysInTheControlRoom.php
index 2d08efc6fc9..06a4bbdd429 100644
--- a/core/modules/system/tests/modules/error_service_test/src/MonkeysInTheControlRoom.php
+++ b/core/modules/system/tests/modules/error_service_test/src/MonkeysInTheControlRoom.php
@@ -63,6 +63,13 @@ public function handle(Request $request, $type = self::MAIN_REQUEST, $catch = TR
       throw new \Exception('Oh oh, bananas in the instruments.');
     }
 
+    if (\Drupal::state()->get('error_service_test.disable_final_exception_subscriber')) {
+      // Prevent the final exception subscriber from catching errors.
+      /** @var \Symfony\Component\EventDispatcher\EventDispatcherInterface $event_dispatcher */
+      $event_dispatcher = \Drupal::service('event_dispatcher');
+      $event_dispatcher->removeSubscriber(\Drupal::service('exception.final'));
+    }
+
     if (\Drupal::state()->get('error_service_test.break_logger')) {
       throw new \Exception('Deforestation');
     }
diff --git a/core/tests/Drupal/FunctionalTests/Bootstrap/UncaughtExceptionTest.php b/core/tests/Drupal/FunctionalTests/Bootstrap/UncaughtExceptionTest.php
index b03e000b48c..a643371aea6 100644
--- a/core/tests/Drupal/FunctionalTests/Bootstrap/UncaughtExceptionTest.php
+++ b/core/tests/Drupal/FunctionalTests/Bootstrap/UncaughtExceptionTest.php
@@ -159,6 +159,8 @@ public function testMissingDependencyCustomErrorHandler() {
     $settings_php .= "\$settings['teapots'] = TRUE;\n";
     file_put_contents($settings_filename, $settings_php);
 
+    \Drupal::state()->set('error_service_test.disable_final_exception_subscriber', TRUE);
+
     $this->drupalGet('broken-service-class');
     $this->assertSession()->statusCodeEquals(418);
     $this->assertSession()->responseContains('Oh oh, flying teapots');