I am trying to implement a webhook in a plugin which should fire everytime a user saves a post. It works fine, but I recive two requests on frontend api. The first request has got a wrong slug. I wonder why this is happening or what I am doing wrong here. The second call works perfect.

 defined('ABSPATH') or die('Unauthorized access');

 add_action('save_post', 'update_front_end', 10, 2);
 function update_front_end($post_id, $post){

   $exovias_webhooks_options = get_option( 'exovias_webhooks_option_name' ); // Array of All Options
   $secret_0 = $exovias_webhooks_options['secret_0']; // Secret
   $frontendurl_1 = $exovias_webhooks_options['frontendurl_1']; // FrontendUrl

 
  $slug = basename(get_permalink($post_id));
  $url = $frontendurl_1 . '/api/revalidate?secret=" . $secret_0 ."&slug=' . $slug;

   wp_remote_post($url);

}