diff -u b/src/FeaturesConfigInstaller.php b/src/FeaturesConfigInstaller.php
--- b/src/FeaturesConfigInstaller.php
+++ b/src/FeaturesConfigInstaller.php
@@ -60,29 +60,23 @@
    * {@inheritdoc}
    */
   protected function findPreExistingConfiguration(StorageInterface $storage) {
-    // CHANGE START
     // Override
     // Drupal\Core\Config\ConfigInstaller::findPreExistingConfiguration().
     // Allow config that already exists coming from Features.
-    /** @var \Drupal\features\FeaturesManagerInterface $manager */
-    $manager = $this->featuresManager;
-    $features_config = array_keys($manager->listExistingConfig());
+    $features_config = array_keys($this->featuresManager->listExistingConfig());
     // Map array so we can use isset instead of in_array for faster access.
     $features_config = array_combine($features_config, $features_config);
-    // CHANGE END.
     $existing_configuration = array();
     // Gather information about all the supported collections.
     $collection_info = $this->configManager->getConfigCollectionInfo();
 
     foreach ($collection_info->getCollectionNames() as $collection) {
-      $config_to_create = array_keys($this->getConfigToCreate($storage, $collection));
-      $active_storage = $this->getActiveStorages($collection);
+      $config_to_create = array_keys($this->configInstaller->getConfigToCreate($storage, $collection));
+      $active_storage = $this->configInstaller->getActiveStorages($collection);
       foreach ($config_to_create as $config_name) {
         if ($active_storage->exists($config_name)) {
-          // CHANGE START
           // Test if config is part of a Feature package.
           if (!isset($features_config[$config_name])) {
-            // CHANGE END.
             $existing_configuration[$collection][] = $config_name;
           }
         }