Fix captcha validation on multi-page forms

inc/gravityforms/class-addon.php

@@ -12,11 +12,12 @@ namespace Ogre\Captcha\GravityForms;
 
 use Ogre\Singleton;
 use Ogre\Captcha as Plugin;
-use GFForms;
-use GFAddOn;
 use Ogre\Captcha\API;
 use Ogre\Captcha\Settings;
 use Ogre\Captcha\Widget;
+use GFForms;
+use GFAddOn;
+use GFFormDisplay;
 
 defined('ABSPATH') || exit;
 
@@ -132,7 +133,9 @@ final class Addon extends GFAddOn {
     public function validation(array $validation_result, string $context): array {
         if ($context != 'form-submit') return $validation_result;
 
-        if (!Settings::is_connected() || !$this->is_enabled(rgar($validation_result, 'form'))) return $validation_result;
+        $form = $validation_result['form'];
+		if (!GFFormDisplay::is_last_page($form) || rgpost('action') == 'heartbeat') return $validation_result;
+        if (!Settings::is_connected() || !$this->is_enabled($form)) return $validation_result;
 
         $errors = API::process(Widget::get_token());
         if ($errors->has_errors()) {