Category pagination not working

Refer to this link: https://dextratechnologies.in/thesstudioonline/collections/page/2

Also added below code in functions.php

/*
Code Purpose : Remove woocommerce product-category slug
Author: Tutorialswebsite
*/

add_filter(‘request’, function( $vars ) {
global $wpdb;
if( ! empty( $vars[‘pagename’] ) || ! empty( $vars[‘category_name’] ) || ! empty( $vars[‘name’] ) || ! empty( $vars[‘attachment’] ) ) {
$slug = ! empty( $vars[‘pagename’] ) ? $vars[‘pagename’] : ( ! empty( $vars[‘name’] ) ? $vars[‘name’] : ( !empty( $vars[‘category_name’] ) ? $vars[‘category_name’] : $vars[‘attachment’] ) );
$exists = $wpdb->get_var( $wpdb->prepare( “SELECT t.term_id FROM $wpdb->terms t LEFT JOIN $wpdb->term_taxonomy tt ON tt.term_id = t.term_id WHERE tt.taxonomy = ‘product_cat’ AND t.slug = %s” ,array( $slug )));
if( $exists ){
$old_vars = $vars;
$vars = array(‘product_cat’ => $slug );
if ( !empty( $old_vars[‘paged’] ) || !empty( $old_vars[‘page’] ) )
$vars[‘paged’] = ! empty( $old_vars[‘paged’] ) ? $old_vars[‘paged’] : $old_vars[‘page’];
if ( !empty( $old_vars[‘orderby’] ) )
$vars[‘orderby’] = $old_vars[‘orderby’];
if ( !empty( $old_vars[‘order’] ) )
$vars[‘order’] = $old_vars[‘order’];
}
}
return $vars;
});