https://github.com/w3c/web-platform-tests/commit/7c782f4591a62159a33d7820b6d648f57ab76c5d#diff-f23ebe2bdee04a9c0b8ab094be59f318, which is being imported from upstream, is triggering a DCHECK in virtual/outofblink-cors/external/wpt/service-workers/service-worker/fetch-event.https.html in the CQ bots:

STDERR: CONSOLE ERROR: Error parsing 'integrity' attribute ('gs0nqru8KbsrIt5YToQqS9fYao4GQJXtcId610g7cCU='). The hash algorithm must be one of 'sha256', 'sha384', or 'sha512', followed by a '-' character.
STDERR: [1:1:0329/013522.047735:FATAL:DocumentThreadableLoader.cpp(1112)] Check failed: fallback_request_for_service_worker_.IsNull(). 
STDERR: #0 0x0000034dc25c base::debug::StackTrace::StackTrace()
STDERR: #1 0x0000034fb09b logging::LogMessage::~LogMessage()
STDERR: #2 0x000005b5ee2f blink::DocumentThreadableLoader::HandleSuccessfulFinish()
STDERR: #3 0x000005b5e2f2 blink::DocumentThreadableLoader::NotifyFinished()
STDERR: #4 0x000002ab5657 blink::Resource::NotifyFinished()
STDERR: #5 0x000002ab6a3b blink::Resource::Finish()
STDERR: #6 0x000002aca2a7 blink::ResourceFetcher::HandleLoaderFinish()
STDERR: #7 0x000002ae08d8 blink::ResourceLoader::DidFinishLoading()
STDERR: #8 0x0000064ba49b content::WebURLLoaderImpl::Context::OnCompletedRequest()
STDERR: #9 0x0000064bade8 content::WebURLLoaderImpl::RequestPeerImpl::OnCompletedRequest()
STDERR: #10 0x0000064bdaa6 content::ResourceDispatcher::OnRequestComplete()
STDERR: #11 0x0000015b3f89 content::ThrottlingURLLoader::OnComplete()
STDERR: #12 0x00000150f941 network::mojom::URLLoaderClientStubDispatch::Accept()
STDERR: #13 0x0000035b5162 mojo::InterfaceEndpointClient::HandleValidatedMessage()
STDERR: #14 0x0000035b4d06 mojo::FilterChain::Accept()
STDERR: #15 0x0000035b6612 mojo::InterfaceEndpointClient::HandleIncomingMessage()
STDERR: #16 0x0000035bdbed mojo::internal::MultiplexRouter::ProcessIncomingMessage()
STDERR: #17 0x0000035bcfb0 mojo::internal::MultiplexRouter::Accept()
STDERR: #18 0x0000035b4d06 mojo::FilterChain::Accept()
STDERR: #19 0x0000035b222b mojo::Connector::ReadSingleMessage()
STDERR: #20 0x0000035b2cb4 mojo::Connector::ReadAllAvailableMessages()
STDERR: #21 0x0000035b2b16 mojo::Connector::OnHandleReadyInternal()
STDERR: #22 0x000001e637c4 mojo::SimpleWatcher::DiscardReadyState()
STDERR: #23 0x0000035ac785 mojo::SimpleWatcher::OnHandleReady()
STDERR: #24 0x0000035acd0e _ZN4base8internal7InvokerINS0_9BindStateIMN4mojo13SimpleWatcherEFvijRKNS3_18HandleSignalsStateEEJNS_7WeakPtrIS4_EEijS5_EEEFvvEE7RunImplIRKS9_RKNSt3__15tupleIJSB_ijS5_EEEJLm0ELm1ELm2ELm3EEEEvOT_OT0_NSI_16integer_sequenceImJXspT1_EEEE
STDERR: #25 0x0000034dd85f base::debug::TaskAnnotator::RunTask()
STDERR: #26 0x000002b173c6 blink::scheduler::internal::ThreadControllerImpl::DoWork()
STDERR: #27 0x000001a99578 _ZN4base8internal7InvokerINS0_9BindStateIMN7network17ResourceScheduler28ScheduledResourceRequestImplEFvNS3_12_GLOBAL__N_19StartModeEEJNS_7WeakPtrIS5_EES7_EEEFvvEE7RunOnceEPNS0_13BindStateBaseE
STDERR: #28 0x0000034dd85f base::debug::TaskAnnotator::RunTask()
STDERR: #29 0x0000035025f6 base::internal::IncomingTaskQueue::RunTask()
STDERR: #30 0x000003500a77 base::MessageLoop::RunTask()
STDERR: #31 0x000003500e9a base::MessageLoop::DeferOrRunPendingTask()
STDERR: #32 0x00000350112e base::MessageLoop::DoWork()
STDERR: #33 0x000003504c56 base::MessagePumpDefault::Run()
STDERR: #34 0x0000035002ec base::MessageLoop::Run()
STDERR: #35 0x000003529976 base::RunLoop::Run()
STDERR: #36 0x0000069745f1 content::RendererMain()
STDERR: #37 0x000002b80678 content::RunZygote()
STDERR: #38 0x000002b80e5a content::RunNamedProcessTypeMain()
STDERR: #39 0x000002b81f32 content::ContentMainRunnerImpl::Run()
STDERR: #40 0x000004b00699 service_manager::Main()
STDERR: #41 0x000001f24984 content::ContentMain()
STDERR: #42 0x00000147f139 main
STDERR: #43 0x7f69c6016f45 __libc_start_main
STDERR: #44 0x00000147f02a _start

See e.g. https://ci.chromium.org/p/chromium/builders/luci.chromium.try/linux_chromium_rel_ng/56909