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WooCommerce custom add to cart function adding only first item

I am running a custom function that adds an item variation to the cart. It is registered as a route route. The code of the function:

        try {
            require WP_PLUGIN_DIR . '/woocommerce/includes/wc-cart-functions.php';
            require WP_PLUGIN_DIR . '/woocommerce/includes/wc-notice-functions.php';
            WC()->session = new WC_Session_Handler();
            WC()->session->init();
            if (!WC()->cart) {
                WC()->initialize_cart();
            }
            $passed_validation = apply_filters('woocommerce_add_to_cart_validation', true, $_POST['product'], $_POST['quantity'], $_POST['variation']);
            $product_status = get_post_status($_POST['product']);
            if ($product_status == 'publish' && $passed_validation && WC()->cart->add_to_cart($_POST['product'], $_POST['quantity'], $_POST['variation'])) {
                do_action('woocommerce_ajax_added_to_cart', $_POST['product']);
                wc_add_to_cart_message($_POST['product']);
            }
        } catch (Exception $e) {
            error_log($e->getMessage());
        }

The add_to_cart function correctly returns the variation hash and the "add to cart message" correctly appears in the cart. However, only the first product is actually added to the cart. After I remove that added item, I can add a product to the cart again.

Is this a correct behaviour? The function should add a new product to the cart no matter how many products are already in there.

I also tried running this code without woocommerce_add_to_cart_validation filter and woocommerce_ajax_added_to_cart action and it works exactly the same way.

All the products are in stock.



source https://stackoverflow.com/questions/70396645/woocommerce-custom-add-to-cart-function-adding-only-first-item
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