diff --git a/core/includes/theme.inc b/core/includes/theme.inc
index 8c947e2..d8fac86 100644
--- a/core/includes/theme.inc
+++ b/core/includes/theme.inc
@@ -221,7 +221,7 @@ function _theme($hook, $variables = array()) {
   // theme registry to work with, and therefore cannot process the theme
   // request properly. See also \Drupal\Core\Theme\Registry::get().
   if (!$module_handler->isLoaded() && !defined('MAINTENANCE_MODE')) {
-    throw new Exception(t('_theme() may not be called until all modules are loaded.'));
+    //throw new Exception(t('_theme() may not be called until all modules are loaded.'));
   }
 
   /** @var \Drupal\Core\Utility\ThemeRegistry $theme_registry */
diff --git a/core/lib/Drupal/Core/DrupalKernel.php b/core/lib/Drupal/Core/DrupalKernel.php
index c014e4a..2f0e43e 100644
--- a/core/lib/Drupal/Core/DrupalKernel.php
+++ b/core/lib/Drupal/Core/DrupalKernel.php
@@ -421,7 +421,7 @@ public function getContainer() {
    */
   public function preHandle(Request $request) {
     // Load all enabled modules.
-    $this->container->get('module_handler')->loadAll();
+    //$this->container->get('module_handler')->loadAll();
 
     // Initialize legacy request globals.
     $this->initializeRequestGlobals($request);
diff --git a/core/lib/Drupal/Core/Extension/ModuleHandler.php b/core/lib/Drupal/Core/Extension/ModuleHandler.php
index 035e75f..1d7e394 100644
--- a/core/lib/Drupal/Core/Extension/ModuleHandler.php
+++ b/core/lib/Drupal/Core/Extension/ModuleHandler.php
@@ -368,6 +368,7 @@ public function implementsHook($module, $hook) {
    * {@inheritdoc}
    */
   public function invoke($module, $hook, array $args = array()) {
+    $this->loadAll();
     if (!$this->implementsHook($module, $hook)) {
       return;
     }
@@ -506,9 +507,11 @@ protected function getImplementationInfo($hook) {
       $this->verified = array();
       if ($cache = $this->cacheBackend->get('module_implements')) {
         $this->implementations = $cache->data;
+        $this->loadAll();
       }
     }
     if (!isset($this->implementations[$hook])) {
+      $this->loadAll();
       // The hook is not cached, so ensure that whether or not it has
       // implementations, the cache is updated at the end of the request.
       $this->cacheNeedsWriting = TRUE;
@@ -518,6 +521,7 @@ protected function getImplementationInfo($hook) {
       $this->verified[$hook] = TRUE;
     }
     elseif (!isset($this->verified[$hook])) {
+      $this->loadAll();
       if (!$this->verifyImplementations($this->implementations[$hook], $hook)) {
         // One or more of the implementations did not exist and need to be
         // removed in the cache.
diff --git a/core/lib/Drupal/Core/StreamWrapper/StreamWrapperManager.php b/core/lib/Drupal/Core/StreamWrapper/StreamWrapperManager.php
index 43532a0..45cf109 100644
--- a/core/lib/Drupal/Core/StreamWrapper/StreamWrapperManager.php
+++ b/core/lib/Drupal/Core/StreamWrapper/StreamWrapperManager.php
@@ -279,7 +279,7 @@ public function addStreamWrapper($service_id, $class, $scheme) {
    * Internal use only.
    */
   public function register() {
-    $this->moduleHandler->alter('stream_wrappers', $this->info);
+    //$this->moduleHandler->alter('stream_wrappers', $this->info);
 
     foreach ($this->info as $scheme => $info) {
       $this->registerWrapper($scheme, $info['class'], $info['type']);
diff --git a/core/modules/filter/src/FilterFormatListBuilder.php b/core/modules/filter/src/FilterFormatListBuilder.php
index 0003cfa..00b1743 100644
--- a/core/modules/filter/src/FilterFormatListBuilder.php
+++ b/core/modules/filter/src/FilterFormatListBuilder.php
@@ -107,6 +107,8 @@ public function buildRow(EntityInterface $entity) {
     }
     else {
       $row['label'] = $this->getLabel($entity);
+      \Drupal::moduleHandler()->load('user');
+      \Drupal::moduleHandler()->load('filter');
       $roles = array_map('\Drupal\Component\Utility\String::checkPlain', filter_get_roles_by_format($entity));
       $roles_markup = $roles ? implode(', ', $roles) : $this->t('No roles may use this format');
     }
diff --git a/core/modules/language/src/DefaultLanguageItem.php b/core/modules/language/src/DefaultLanguageItem.php
index 0ef14e2..6438554 100644
--- a/core/modules/language/src/DefaultLanguageItem.php
+++ b/core/modules/language/src/DefaultLanguageItem.php
@@ -48,6 +48,7 @@ public function applyDefaultValue($notify = TRUE) {
    *  A string language code.
    */
   public function getDefaultLangcode(EntityInterface $entity) {
+    \Drupal::moduleHandler()->load('language');
     return language_get_default_langcode($entity->getEntityTypeId(), $entity->bundle());
   }
 
diff --git a/core/modules/node/src/Entity/NodeType.php b/core/modules/node/src/Entity/NodeType.php
index 73e1202..97a8051 100644
--- a/core/modules/node/src/Entity/NodeType.php
+++ b/core/modules/node/src/Entity/NodeType.php
@@ -87,7 +87,7 @@ class NodeType extends ConfigEntityBundleBase implements NodeTypeInterface {
    *
    * @var int
    */
-  protected $preview_mode = DRUPAL_OPTIONAL;
+  protected $preview_mode = 1;
 
   /**
    * Display setting for author and date Submitted by post information.
diff --git a/core/modules/simpletest/src/Form/SimpletestTestForm.php b/core/modules/simpletest/src/Form/SimpletestTestForm.php
index b55de4c..c168352 100644
--- a/core/modules/simpletest/src/Form/SimpletestTestForm.php
+++ b/core/modules/simpletest/src/Form/SimpletestTestForm.php
@@ -111,6 +111,7 @@ public function buildForm(array $form, FormStateInterface $form_state) {
     );
 
     // Generate the list of tests arranged by group.
+    \Drupal::moduleHandler()->load('simpletest');
     $groups = simpletest_test_get_all();
     foreach ($groups as $group => $tests) {
       $form['tests'][$group] = array(
diff --git a/core/modules/user/src/Controller/UserController.php b/core/modules/user/src/Controller/UserController.php
index be1b03d..1def11e 100644
--- a/core/modules/user/src/Controller/UserController.php
+++ b/core/modules/user/src/Controller/UserController.php
@@ -167,6 +167,7 @@ public function userTitle(UserInterface $user = NULL) {
    *   A redirection to home page.
    */
   public function logout() {
+    \Drupal::moduleHandler()->load('user');
     user_logout();
     return $this->redirect('<front>');
   }
diff --git a/core/modules/user/src/Form/UserLoginForm.php b/core/modules/user/src/Form/UserLoginForm.php
index 4cfdff3..0466adf 100644
--- a/core/modules/user/src/Form/UserLoginForm.php
+++ b/core/modules/user/src/Form/UserLoginForm.php
@@ -83,7 +83,8 @@ public function buildForm(array $form, FormStateInterface $form_state) {
       '#type' => 'textfield',
       '#title' => $this->t('Username'),
       '#size' => 60,
-      '#maxlength' => USERNAME_MAX_LENGTH,
+      //'#maxlength' => USERNAME_MAX_LENGTH,
+      '#maxlength' => 60,
       '#description' => $this->t('Enter your @s username.', array('@s' => $this->config('system.site')->get('name'))),
       '#required' => TRUE,
       '#attributes' => array(