When using the new 3.6.x (currently at .1) WC with current X, the structured data for reviews is broken, please provide a template update/new version asap. 3.6 is quite critical for sites as it improves significantly admin interface responsiveness so therefore fast update to 3.6 is important.
WC 3.7 heads-up: Seems WC is finally taking reviews Structured data seriously so is this is included in 3.7, then X should drop any own implementation of Reviews: https://github.com/woocommerce/woocommerce/issues/23299