Display WooCommerce size product attribute on shop page

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Your code is outdated since WooCommerce 3.
First, you need to target variable products type only to avoid errors on other products types and also $product is already the product object.

Also you can also directly use the WC_Product method get_attribute() and your code will be much more simpler, compact and efficient:

add_action( 'woocommerce_after_shop_loop_item_title', 'display_size_attribute', 5 );
function display_size_attribute() {
    global $product;

    if ( $product->is_type('variable') ) {
        $taxonomy = 'pa_size';
        echo '<span class="attribute-size">' . $product->get_attribute($taxonomy) . '</span>';
    }
}

Code goes in functions.php file of the active child theme (or active theme). Tested and works.

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