php - Post meta fields are correctly updating for woocommerce custom fields but same was not showing in product page

I am strugling from 2 days to sort out the issue but unable to do so.. i am trying to customize woocommerce gift card plugin and make it editable on vendor page using dokan plugin. Everything is working fine. Post meta is updating accurately as desired but postmeta values are not working on product page. is it any issue relaing to woocommerce? or we need specific action for woocommerce in order to make it work? Here is thepost_meta which is saving on database:

a:6:{s:13:"default_price";i:0;s:4:"type";s:19:"mwb_wgm_range_price";s:8:"template";i:4751;s:14:"by_default_tem";b:1;s:4:"from";s:1:"1";s:2:"to";s:1:"3";}
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i am using below action to save post_meta values:

add_action( 'dokan_new_product_added','save_add_product_meta2', 10, 2 );
add_action( 'dokan_product_updated', 'save_add_product_meta2', 10, 2 );

function save_add_product_meta2($product_id, $postdata){

    if ( ! dokan_is_user_seller( get_current_user_id() ) ) {
            return;
        }
if ( ! empty( $postdata['new_field_4'] ) ) {
            update_post_meta( $product_id, 'new_field_4', $postdata['new_field_4'] );
        }
}
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Any help is highly appreciated.

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