[ci-scan] Test failure: SmtpClientTlsTest.SslOptions_AssignmentDuringSendThrows #135353

Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1626454
Build error leg or test failing: System.Net.Mail.Functional.Tests-SmtpClientTlsTest.SslOptions_AssignmentDuringSendThrows
Pull request: #134418

Error Details

System.Net.Mail.Tests.SmtpClientTlsTest_Send.SslOptions_AssignmentDuringSendThrows [FAIL]
  Assert.True() Failure
  Expected: True
  Actual:   False
  Stack Trace:
    /_/src/libraries/System.Net.Mail/tests/Functional/SmtpClientTlsTest.cs(371,0): at System.Net.Mail.Tests.SmtpClientTlsTest`1.<SslOptions_AssignmentDuringSendThrows>d__18[[System.Net.Mail.Tests.SyncSendMethod, System.Net.Mail.Functional.Tests, Version=11.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51]].MoveNext()

The same failure occurs for multiple send variants across multiple configurations. This test and the affected SmtpClient.SslOptions behavior were introduced by #134919, which is the target-branch commit at the base of the source build; the affected PR changes only System.Net.Quic tests.

Error Message

{
  "ErrorMessage": "at System.Net.Mail.Tests.SmtpClientTlsTest`1.<SslOptions_AssignmentDuringSendThrows>d__18",
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1626454
Error message validated: [at System.Net.Mail.Tests.SmtpClientTlsTest1.<SslOptions_AssignmentDuringSendThrows>d__18`]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 10/7/2026 5:52:17 PM UTC

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Summary