The spec currently says "If the resource is fetched by a cross-origin stylesheet which was fetched with no-cors policy, abort the remaining steps." This seems to mean that all subresources from such stylesheet should be ignored. But the current wording could be interpreted as only direct fetches from the stylesheet. For example, consider this fetch chain:
stylesheet A -> stylesheet B -> resource C
In this case, when A is no-cors cross-origin, I believe C's RT information should not be exposed, and we should make this clear.