[WIP] Fix failing GitHub Actions job ci (highest, macos-15, 3.14, nocov)

[Copilot]

• Analyze failing GitHub Actions job logs for run 28343680151/job 83962874355
• Reproduce the failing conformance test locally (or nearest equivalent) to confirm root cause
• Implement the smallest fix in conformance test/server logic
• Add or update focused test coverage for the fix
• Run targeted tests for changed area, then relevant broader checks
• Run security/quality validation and report final results

[anuraaga]

I must have accidentally pressed some button