diff --git a/core/lib/Drupal/Core/Entity/EntityBCDecorator.php b/core/lib/Drupal/Core/Entity/EntityBCDecorator.php
index e51f121..dff6e42 100644
--- a/core/lib/Drupal/Core/Entity/EntityBCDecorator.php
+++ b/core/lib/Drupal/Core/Entity/EntityBCDecorator.php
@@ -184,6 +184,7 @@ public function __set($name, $value) {
     // out of sync. That way, the next field object instantiated by EntityNG
     // will hold the updated value.
     unset($this->decorated->fields[$name]);
+    $this->decorated->onChange($name);
   }
 
   /**