shortcode not working

Hi.

After the last update in 5.7.5.1, the “shortcode_atts_wpcf7” filter stopped working. Do you know where the problem is?

Form:

[hidden offer default:shortcode_attr]

functions.php:

// Contactform7: shortcodes
add_filter('shortcode_atts_wpcf7', 'maus_shortcode_atts_wpcf7_filter', 10, 3);
function maus_shortcode_atts_wpcf7_filter( $out, $pairs, $atts ) {
    if( isset($atts['offer']) ) $out['offer'] = $atts['offer'];
    return $out;
}

single.php:

[contact-form-7 title="Dopytový formulár: ponuka" html_id="form-demand" offer="XYZ"]

Thanks