Woof removes .html exension

Hi,
I am using .html extension because my shop was migrated from old magento.
So SOME of my product categories has .html.
e.g.
https://moda24h.eu/mezczyzna/obuwie-meskie/casual-sneakers.html
The category slug is casual-sneakers.html in this case.

But when I use WOOF from its parent category:
https://moda24h.eu/mezczyzna/obuwie-meskie
(left column Podkategorie produktu > Casual,sneakers)
Then plugin cuts .html and causes 404 error.

Is there a way the plugin not to erase the .html part?

PS.
The code I use to sanitize:

remove_filter( 'sanitize_title', 'sanitize_title_with_dashes');
add_filter( 'sanitize_title', 'restore_raw_title', 9, 3 );

function sweURLtoCHAR($text)
{
  $url=array(
    "-","-","-","-","-"
  );
  $char=array(
     "/","%","&",","," "
  );

  $str = str_replace($char,$url,$text);
  $str_new = str_replace(" ", "", $str);
  return strtolower($str_new);
}
function restore_raw_title( $title, $raw_title, $context ) {
  if ( $context == 'save' )
   return sweURLtoCHAR($raw_title);
  else {
   $title_new = str_replace(" ", "-", $title);
	  return strtolower($title_new);
  }
}

Regards,
Dominik