fix: autoprepend causing wrong options field values

see https://processwire.com/talk/topic/29225-show-this-field-only-if-doesnt-seem-to-work/?do=findComment&comment=237096

AutoPrepend.php

@@ -1,11 +1,28 @@
-<?php namespace ProcessWire;
+<?php
+
+namespace ProcessWire;
+
 /**
  * This file is automatically added to the prependFile array.
  * If you are using /site/templates/_init.php this file ensures that all defined
  * variables and functions are available from every file that is rendered via
  * RockFrontend.
  */
-if($rockfrontend->autoprepended) return;
-$vars = array_merge(get_defined_vars(), (array)$this->wire('all'));
-foreach($vars as $k=>$v) $this->wire($k, $v);
+if ($rockfrontend->autoprepended) return;
+
+// this fixes the issue that $page->any_options_field->title
+// shows the page title instead of the options' value title
+// see https://processwire.com/talk/topic/29225-show-this-field-only-if-doesnt-seem-to-work/?do=findComment&comment=237096
+$vars = get_defined_vars();
+foreach ($page->getFields() as $field) {
+  if (!array_key_exists($field->name, $vars)) continue;
+  unset($vars[$field->name]);
+}
+
+// merge arrays and make them available as API variable
+$vars = array_merge($vars, (array)$this->wire('all'));
+foreach ($vars as $k => $v) {
+  $this->wire($k, $v);
+}
+
 $rockfrontend->autoprepended = true;