Purge all caches for single product page programmatically?

Hello,
Can someone please help me, I’m trying to flush page cache for a single product with this code:

if(!get_the_content()){
    $generate_content = 'Some Content';
    $update_product_content = array(
        'ID'=>$product_page_id,
        'post_content'=>$generate_content
    );
    wp_update_post($update_product_content);

    if(defined('LSCWP_V')){
        do_action('litespeed_purge_url', get_the_permalink());
    } //FLUSH CACHE LiteSpeed
}

But nothing’s happening on the front-end after refreshing the page in the browser – I still see cached version of the page, while in the back-end I see message, that cache for the url was succesfully purged.

I have tried also to use this code:

if(defined('LSCWP_V')){do_action('litespeed_purge_post', $product_page_id);}

But with this hook, I don’t even see a message in the back-end, that cache for the page was purged.

I’m using latest version of LiteSpeed Plugin, WordPress and Woocommerce with Memcache Object Caching & OPcache.