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ok it seems the proper way to do this is:

$product = new Product($id, false, $lang);
$img = $product->getCover($id);
$url = Context::getContext()->link->getImageLink(isset($product->link_rewrite) ? $product->link_rewrite : $product->name, (int) $img['id_image'], 'small_default');

return (new ProductDetails())->setId($id)->setName($product->getProductName($id, null, $lang))->setThumbnail($url);