add_filter('wc_price_args', 'wc_force_decimals_for_price_display');
function wc_force_decimals_for_price_display($args) {
    if (isset($args['force_decimals'])) {
        $args['decimals'] = $args['force_decimals'];
    } else {
        $args['decimals'] = 2;
    }

    return $args;
}