'save_post' hook not firing within a plugin

Hello

I built a plugin to handle custom post types. Within that plugin meta data should be modified if some requirements are met after modification of the post. When I hook to ‘save_post’ within the plugin it never gets fired, however if I simply move the add_action sentence to the child theme functions.php the hook is fired correctly.

Here is the code:

<?php
/*
Plugin Name: MDV CPT Plugin
Author: MDV
Version: 1.1
*/

defined( ‘ABSPATH’ ) or die( ‘This is a WordPress Plugin – No direct access permitted!’ );

add_action(‘save_post’, ‘validar_promocio_ini’,10,3);
add_action(‘edit_post’, ‘validar_promocio_ini’,10,3);

function validar_promocio_ini( $post_id , $post)
{

// Don’t run the echo if this is an auto save
if (defined(‘DOING_AUTOSAVE’) && DOING_AUTOSAVE )
return;

// If this is a revision, get real post ID
if ($parent_id = wp_is_post_revision( $post_id ) )
$post_id = $parent_id;

// Run only for events that go publish or future
$poststatus= get_post_status($post_id);
if ($poststatus !=’publish’ && $poststatus != ‘future’ )
return;

/* Based on some logic, update meta data */

return;
}

Could the problem depend on the load order of plugins vs functions.php?

Thanks

Zulok