WP Rocket - Causes Incorrect Category Assignment for Translated Posts with "Display as Translated" Option

Overview of the issue

When WP Rocket is used on a site configured with WPML’s « Display as Translated » option, you will notice that when a post is translated the categories are not being copied, even though the option to « Copy taxonomies to translations » is enabled.

Workaround

Please, make sure of having a full backup of your site before proceeding.

• Add this code to your theme’s functions.php file:

  add_action('after_rocket_clean_post', function( $post ){
  		wp_cache_delete($post->ID, 'WPML_Cache_Terms_Per_Lang');
  });