Last Update Not Showing On Google Serp

Hi, All my article not showing Last Update on google serp see this screenshoot

btw i am using this code on my gp child theme.

add_filter( 'generate_post_date_output', db_modified_time_stamp, 20, 2);

function db_modified_time_stamp( $output, $time_string ) {
        $time_string = '<time class="entry-date published" datetime="%1$s" itemprop="datePublished">Dipublish Pada : %2$s</time> ';

    if ( get_the_time( 'U' ) !== get_the_modified_time( 'U' ) ) {
       	$time_string = '<time class="updated" datetime="%3$s" itemprop="dateModified">Diperbarui Pada : %4$s</time> ' . $time_string;
    }
	
	// get modified time and published time. Compare the two, If modified date exists then ouput both time strings with modified date
	$updated_time = get_the_modified_time( 'U' );
    $published_time = get_the_time( 'U' ) + 86400;
    
    if ( $updated_time > $published_time ) {
        $time_string = '<time class="entry-date updated-date" datetime="%3$s" itemprop="dateModified" style="display:inline;">Diperbarui Pada : %4$s</time>';
    }

        $time_string = sprintf( $time_string,
            esc_attr( get_the_date( 'c' ) ),
            esc_html( get_the_date('F j Y') ),
            esc_attr( get_the_modified_date( 'c' ) ),
            esc_html( get_the_modified_date('F j Y') )
        );

    $post_date = new DateTime(get_the_date( 'Y-m-d' ));
    $modified_date = new DateTime(get_the_modified_date( 'Y-m-d' ));
    $current_date = new DateTime(date('Y-m-d'));
    $published_date_interval = $post_date->diff($current_date);
    $modified_date_interval = $modified_date->diff($current_date);

    if ($published_date_interval->y < 2 || $modified_date_interval->y < 2 ){
      return sprintf( '<span class="posted-on">%1$s </span>', // WPCS: XSS ok, sanitization ok.
            sprintf( '%1$s',
                $time_string
            )
      );
    } if ($published_date_interval->y >= 2 || $modified_date_interval->y >= 2 ) {
      return;
    }
}

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