Can't access node-taxonomy.tpl.php through page-taxonomy-term.tpl in Drupal 6

I've been trying to customize taxonomy page template in my Drupal 6 site.

What I did was

• created page-taxonomy-term.tpl.php
• created node-taxonomy.tpl.php

• Entered following code in template.php:

   function templateNAME_preprocess_node(&$vars) {
    if (arg(0) == 'taxonomy') {
      $suggestions = array(
        'node-taxonomy'
      );
      $vars['template_files'] = array_merge($vars['template_files'], $suggestions);
    } 
  

My Taxonomy page is picking up page-taxonomy-term.tpl.php correctly but it just doesn't pick up node-taxonomy.tpl.php and I tried just almost everything.

below few tips and attempts to do:

• if you are working on subtheme, copy node.tpl.php from parent theme to the folder under subtheme (mandatory in drupal 6 themes).
• try to check if the node-taxonomy suggestions is correctly added in object $node. var_dump($node) inside the main node.tpl.php and check if is present.
• last tips: check the permission of the file tpl, maybe is not readable from the web server.