diff --git a/core/lib/Drupal/Component/Plugin/LazyPluginCollection.php b/core/lib/Drupal/Component/Plugin/LazyPluginCollection.php
index 2b59056..e2fbec2 100644
--- a/core/lib/Drupal/Component/Plugin/LazyPluginCollection.php
+++ b/core/lib/Drupal/Component/Plugin/LazyPluginCollection.php
@@ -148,10 +148,11 @@ public function getInstanceIds() {
    *   An array of plugin instances.
    */
   public function getInstances() {
+    $instances = [];
     foreach ($this->getInstanceIds() as $instance_id) {
-      $this->get($instance_id);
+      $instances[$instance_id] = $this->get($instance_id);
     }
-    return $this->pluginInstances;
+    return $instances;
   }
 
   /**