Expired cart removes products but does not delete the nodes

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Same here, it's not working.
Have you found a work around you could share?

I've made this fix for uc_node_checkout.module and seems to be working very good so far.

All you need to do is replace the current uc_node_checkout_cart_item function on line #660 with the code below:

/**
 * Implementation of UC hook_cart_item().
 */
function uc_node_checkout_cart_item($op, &$item) {
  switch ($op) {
    case 'load':
      // Load the entire related node into the item array for use in display.
      if (isset($item->data['node_checkout_nid']) && $node = node_load($item->data['node_checkout_nid'])) {
        $item->checkout_node = $node;
      }
      break;
    case 'remove':
      // Remove related node_checkout nodes when cart expires and cart gets emptied by cron.
      $data = unserialize($item->data);
      if(variable_get('cron_semaphore', FALSE) && isset($data['node_checkout_nid'])){
        node_delete($data['node_checkout_nid']);
      }
      break;
  }
}

Please test it on your end guys and post any feedback...

This should be fixed by a documentation change, e.g. you need to give permission to the user to delete the node.