This is failing because FetchEvent#isReload isn't set for reload requests. FetchEvent#isReload is deprecated (issue 652994) but we still need to support it.

ToWebServiceWorkerRequest() sets isReload to true when |transition_type| of network::ResourceRequest is PAGE_TRANSITION_RELOAD[1].

[1] https://cs.chromium.org/chromium/src/content/renderer/service_worker/service_worker_context_client.cc?rcl=9b11dbe5ef9b56788ff997ba9945a7b65842cd8c&l=229

However, with S13nServiceWorker, |transition_type| is always unset for some reason. At least, at the point a ResourceRequest being passed to ServiceWorkerControlleeRequestHandler::MaybeCreateLoader(), it's |transition_type| isn't set accordingly. Since ServiceWorkerNavigationLoader uses the ResourceRequest passed to ServiceWorkerControlleeRequestHandler::MaybeCreateLoader(), |transition_type| of the given ResourceRequest should be set or overridden to PAGE_TRANSITION_RELOAD when the request is a reload.

Here is a quick hack to override |transition_type|[2], but I don't think this is a right approach.

[2] https://chromium-review.googlesource.com/#/c/chromium/src/+/1068536

FYI, here are how non-S13nServiceWorker works:
- A ResourceRequestInfoImpl is created in ResourceDispatcherHostImpl::BeginNavigationRequest(), which has |common_params.transition|.
- The info is attached to the corresponding URLRequest.
- ServiceWorkerURLRequestJob::CreateResourceRequest() retrieves the info via ResourceRequestInfo::ForRequest() then set |transition_type| to info's |common_params.transition|[3].

[3] https://cs.chromium.org/chromium/src/content/browser/service_worker/service_worker_url_request_job.cc?l=582&rcl=27af8e0a6de92fc683661ae453ed7a2a1edc7c6e