Why is my update_metafields.js action for gadget model not updating metafields in Shopify?

[kurs]

I have a problem with updating shopify metafields through gadget model actions. I've created a update_metafields.js action for shopifyProduct model and it doesn't work. Also doesn't send any errors when used through button in shopify store front.

update_metafields.js :

/**

 * Action code for update on Shopify Product

 * @Anonymous { import("gadget-server").UpdateShopifyProductActionContext } context - Everything for running this action, like the api client, current record, params, etc.

 */

export async function run({ api, record, params, connections }) {

    await connections.shopify.current?.graphql(

        `mutation metafieldsSet($metafields: [MetafieldsSetInput!]!) {

            metafieldsSet(metafields: $metafields) {

              metafields {

                id

                value

              }

              userErrors {

                field

                message

              }

            }

          }`,

        {

            metafields: [

                {

                    key: "title_2",

                    namespace: "custom",

                    ownerId: `gid://shopify/Product/${record.id}`,

                    type: "single_line_text_field",

                    value: record.title_2 + " as a metafield!",

                },

            ],

        }

    );

}

function used in button: 

async function updateProduct() {
try {
await api.shopifyProduct.update_metafields(productId);
console.log("Product updated successfully");
} catch (error) {
console.error("Error updating product:", error);
}
}
updateProduct();