diff -Nuar a/vendor/magento/framework/App/DeploymentConfig.php b/vendor/magento/framework/App/DeploymentConfig.php
--- a/vendor/magento/framework/App/DeploymentConfig.php
+++ b/vendor/magento/framework/App/DeploymentConfig.php
@@ -86,7 +86,6 @@ public function get($key = null, $defaultValue = null)
      */
     public function isAvailable()
     {
-        $this->data = null;
         $this->load();
         return isset($this->flatData[ConfigOptionsListConstants::CONFIG_PATH_INSTALL_DATE]);
     }
@@ -141,7 +140,7 @@ public function isDbAvailable()
      */
     private function load()
     {
-        if (null === $this->data) {
+        if (empty($this->data)) {
             $this->data = $this->reader->load();
             if ($this->overrideData) {
                 $this->data = array_replace($this->data, $this->overrideData);
@@ -173,10 +172,12 @@ private function flattenParams(array $params, $path = null)
                 $newPath = $key;
             }
             if (isset($cache[$newPath])) {
+                //phpcs:ignore Magento2.Exceptions.DirectThrow
                 throw new \Exception("Key collision {$newPath} is already defined.");
             }
             $cache[$newPath] = $param;
             if (is_array($param)) {
+                //phpcs:ignore Magento2.Performance.ForeachArrayMerge
                 $cache = array_merge($cache, $this->flattenParams($param, $newPath));
             }
         }
diff -Nuar a/vendor/magento/framework/Locale/Resolver.php b/vendor/magento/framework/Locale/Resolver.php
--- a/vendor/magento/framework/Locale/Resolver.php
+++ b/vendor/magento/framework/Locale/Resolver.php
@@ -15,7 +15,7 @@
 class Resolver implements ResolverInterface
 {
     /**
-     * Default locale
+     * Resolver default locale
      */
     const DEFAULT_LOCALE = 'en_US';

@@ -79,7 +79,7 @@ public function __construct(
         $this->scopeConfig = $scopeConfig;
         $this->defaultLocalePath = $defaultLocalePath;
         $this->scopeType = $scopeType;
-        $this->deploymentConfig = $deploymentConfig ?: ObjectManager::getInstance()->create(DeploymentConfig::class);
+        $this->deploymentConfig = $deploymentConfig ?: ObjectManager::getInstance()->get(DeploymentConfig::class);
         $this->setLocale($locale);
     }

diff -Nuar a/vendor/magento/framework/Module/ModuleList.php b/vendor/magento/framework/Module/ModuleList.php
--- a/vendor/magento/framework/Module/ModuleList.php
+++ b/vendor/magento/framework/Module/ModuleList.php
@@ -59,7 +59,7 @@ public function __construct(DeploymentConfig $config, ModuleList\Loader $loader)
     }

     /**
-     * {@inheritdoc}
+     * @inheritdoc
      *
      * Note that this triggers loading definitions of all existing modules in the system.
      * Use this method only when you actually need modules' declared meta-information.
@@ -84,7 +84,8 @@ public function getAll()
     }

     /**
-     * {@inheritdoc}
+     * @inheritdoc
+     *
      * @see has()
      */
     public function getOne($name)
@@ -94,7 +95,7 @@ public function getOne($name)
     }

     /**
-     * {@inheritdoc}
+     * @inheritdoc
      */
     public function getNames()
     {
@@ -107,7 +108,7 @@ public function getNames()
     }

     /**
-     * {@inheritdoc}
+     * @inheritdoc
      */
     public function has($name)
     {
@@ -139,7 +140,6 @@ public function isModuleInfoAvailable()
      */
     private function loadConfigData()
     {
-        $this->config->resetData();
         if (null === $this->configData && null !== $this->config->get(ConfigOptionsListConstants::KEY_MODULES)) {
             $this->configData = $this->config->get(ConfigOptionsListConstants::KEY_MODULES);
         }