Simply Static Pro: Single Export after save_post

functions.php

<?php

add_action( 'save_post', 'ssp_auto_export', 10, 3 );

/**
 * Automatically run a static export after post is saved.
 *
 * @param  int    $post_id given post id.
 * @param  object $post given post object.
 * @param  bool   $update if it's updated or not.
 * @return void
 */
function ssp_auto_export( $post_id, $post, $update ) {
	$options = get_option( 'simply-static' );
	$single  = simply_static_pro\Single::get_instance();

	$additional_urls = apply_filters( 'ssp_single_export_additional_urls', array_merge( $single->get_related_urls( $post_id ), $single->get_related_attachements( $post_id ) ) );

	// Update option for using a single post.
	update_option( 'simply-static-use-single', $post_id );

	// Clear records before run the export.
	Simply_Static\Page::query()->delete_all();

	// Add URls for static export.
	$single->add_url( $post_id );
	$single->add_additional_urls( $additional_urls, $post_id );

	do_action( 'ssp_before_run_single' );

	// Start static export.
	$ss = Simply_Static\Plugin::instance();
	$ss->run_static_export();
}

Hello, I use same function in my site but when the function is hit on save_post its coping all things, but didn't copy post featured image can you please look out this,
I used Pro Version here is my function

add_action( 'save_post', 'ssp_auto_export', 10, 3 );

/**

• Automatically run a static export after post is saved.

• @param int $post_id given post id.

• @param object $post given post object.

• @param bool $update if it's updated or not.

• @return void
  */
  function ssp_auto_export( $post_id, $post, $update ) {
  $options = get_option( 'simply-static' );
  $single = simply_static_pro\Single::get_instance();

  // $additional_urls = apply_filters( 'ssp_single_export_additional_urls', array_merge( $single->get_related_urls( $post_id ), $single->get_related_attachements( $post_id ) ) );
  $additional_urls = apply_filters( 'ssp_single_export_additional_urls', array_merge( $single->get_related_urls( $post_id ), $single->get_related_attachements( $post_id ) ) );

  // Update option for using a single post.
  update_option( 'simply-static-use-single', $post_id );
  // // Add URls for static export.
  $single->add_url( $post_id );
  $single->add_additional_urls( $additional_urls, $post_id );
  do_action( 'ssp_before_run_single' );

  // Start static export.
  $ss = Simply_Static\Plugin::instance();
  $ss->run_static_export();
  }