Update

src/BoltFormExtendedExtension.php

@@ -21,7 +21,7 @@ class BoltFormExtendedExtension extends SimpleExtension
      */
     protected function subscribe(EventDispatcherInterface $dispatcher)
     {
-        $dispatcher->addListener(BoltFormsEvents::PRE_SET_DATA,  array($this, 'preSetData'));
+        $dispatcher->addListener(BoltFormsEvents::SUBMISSION_PRE_PROCESSOR,  array($this, 'preSetData'));
         $dispatcher->addListener(BoltFormsEvents::PRE_EMAIL_SEND,  array($this, 'preEmailSend'));
     }