Please update to version 2.9.1, and if not using Georgian as default site language, add the following code snippet to your child theme functions.php file or in a PHP code snippet to load a Georgian compatible font:
/**
* Add Noto Sans Georgian font.
*
* @param array $args mPDF args.
* @return array
*/
add_filter( 'wc_cart_pdf_mpdf_args', function( $args ) {
if ( empty( $args['fontdata'] ) || ! is_array( $args['fontdata'] ) ) {
$args['fontdata'] = array();
}
$args['fontdata'] = $args['fontdata'] + array(
'notosans-georgian' => array(
'R' => 'NotoSansGeorgian.ttf',
),
);
$args['default_font'] = 'notosans-georgian';
return $args;
} );