🚧 Reset instances, children and routes properties in Pages::init() prior to calling buildPages()

Useful when calling Pages::init() multiple times, or the properties are
never reset and the subsequent buildPages() calls fail

system/src/Grav/Common/Page/Pages.php

@@ -126,6 +126,10 @@ class Pages
         $this->ignore_folders = $config->get('system.pages.ignore_folders');
         $this->ignore_hidden = $config->get('system.pages.ignore_hidden');
 
+        $this->instances = [];
+        $this->children = [];
+        $this->routes = [];
+
         $this->buildPages();
     }