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#112426 captures 2 test failures: TestW3CHeadersTraceStateAndCorrelationContext is a test bug to be fixed by #112753. However the test TestW3CHeaders also fails on this assertion, which seems to be a product bug.
The reason behind the failure is that when
HttpClient is used (vs HttpWebRequest)
With ActivityIdFormat.W3C (vs the default Hierarchical format)
To certain endpoints (eg. to http://corefx-net-http11.azurewebsites.net/Echo.ashx but not http://example.com)
the event System.Net.Http.Desktop.HttpRequestOut.Start is emitted 2 times for the same HttpWebRequest. There are no multiple physical requests being sent. All 3 conditions have to be met.
My guess is this bug has been around for a long time, and no user reported it, so I would assess the priority as low, but I'm letting the owners to triage.