functions.php

<?php

function prefix_add_site_icon_size( $sizes ) {
  $sizes[] = 152;
  return $sizes;
}
add_filter( 'site_icon_image_sizes', 'prefix_add_site_icon_size' );

function prefix_add_site_icon_tag( $meta_tags ) {
  $meta_tags[] = sprintf( '', esc_url( get_site_icon_url( null, 152) ) );
  return $meta_tags;
}
add_filter( 'site_icon_meta_tags', 'prefix_add_site_icon_tag' );