functions.php

<?php

add_action('blocksy:pro:content-blocks:pre-output', function ($id) {
  if (! class_exists('QUBELY_MAIN')) {
    return;
  }
  
  if (! class_exists('Blocksy_Qubely')) {
    eval("class Blocksy_Qubely extends QUBELY_MAIN {
      public function __construct() {}
    }");
  }

  add_action('wp_enqueue_scripts', function () use ($id) {
    global $post;
    $old_post = $post;

    $hook = get_post($id);

    $post = $hook;
    setup_postdata($hook);

    $qubely_driver = new \Blocksy_Qubely();
    $qubely_driver->qubely_enqueue_style();
    $qubely_driver->qubely_enqueue_scripts();

    wp_reset_postdata();
    $post = $old_post;
  });

  $option_data = get_option( 'qubely_options' );
  $css_save_as = isset(
    $option_data['css_save_as']
  ) ? $option_data['css_save_as'] : 'wp_head';

  if ($css_save_as == 'filesystem') {
    add_action(
      'wp_enqueue_scripts',
      function () use ($id) {
        global $post;
        $old_post = $post;

        $hook = get_post($id);

        $post = $hook;
        setup_postdata($hook);

        $qubely_driver = new \Blocksy_Qubely();
        $qubely_driver->enqueue_block_css_file();

        wp_reset_postdata();
        $post = $old_post;
      }
    );
  } else {
    add_action(
      'wp_head',
      function () use ($id) {
        global $post;
        $old_post = $post;

        $hook = get_post($id);

        $post = $hook;
        setup_postdata($hook);

        $qubely_driver = new \Blocksy_Qubely();
        $qubely_driver->add_block_inline_css();

        wp_reset_postdata();
        $post = $old_post;
      },
      100
    );
  }
});