[CI Postmortem] Flaky: TestNSurlSessionHandlerCookieContainerSetCookies on macOS

[rolfbjarne]

Flaky Test Report (automated)

Test: MonoTests.System.Net.Http.MessageHandlerTest.TestNSurlSessionHandlerCookieContainerSetCookies
Platform: macOS
Period: May 4–11, 2026
Category: Flaky (cross-PR)

Occurrence Summary

PR	Build	Bot	Direct Link
#25330	14017041	VSCXSDKs-MINI-063	Run tests
#25315	14007844	VSCXSDKs-MINI-012	Run tests
#25301	14005358	MACIOSMINI-005	Run tests

Total: Failed in 3 builds across 3 PRs

Error Details

  Cookies received from server.
  Expected: True
  But was:  False

Classification

Related to #25384 (similar cookie handling test on iOS/MacCatalyst). Both tests assert cookie behavior that appears timing/network-dependent.

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This issue was automatically generated by CI post-mortem analysis.