[ci-scan-net11] HybridWebView device tests timeout on Windows — Controls.DeviceTests fail after 480 s (net11.0)

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Summary

Both Controls.DeviceTests-packaged and Controls.DeviceTests-unpackaged consistently time out waiting for HybridWebView test results on Windows (windows.11.amd64.client.open) after exactly 480 seconds, causing the Run DeviceTests Windows job to fail.

Build Information

• Pipeline: maui-pr-devicetests (ID 314)
• Build: 1470382 (latest)
• Branch: net11.0
• First seen: 2026-06-09 (build 1455596)
• Occurrences: 5 in last 10 builds (1470382, 1466521, 1466211, 1455984, 1455596)

Affected Legs

• Controls.DeviceTests-packaged — Windows 11 AMD64 (packaged app)
• Controls.DeviceTests-unpackaged — Windows 11 AMD64 (unpackaged app)
• Helix queue: windows.11.amd64.client.open

Error Message

[FAIL] Timeout waiting for HybridWebView test results after 480 seconds

Helix jobs: 1b3e1f78-5daf-4a45-9525-9e7f0d917531 (latest build), b9f6d4b4-6bf2-4060-8eaa-2a497ffd55ca (prior build)

Recommended Action

1. Investigate HybridWebView device tests on Windows — the test runner is waiting 480 s for results that never arrive, suggesting either a HybridWebView startup hang or a WebView2 initialization failure on the Windows 11 Helix agents.
2. Check src/Controls/tests/DeviceTests/ under the HybridWebView category for Windows-specific initialization paths.
3. Cross-reference with the open IL2026 trim issue ([ci-scan-net11] HybridWebViewHandler IL2026 trim errors break iOS/AOT integration tests on net11.0 #35740) — HybridWebViewHandler members on iOS are decorated with [RequiresUnreferencedCode], which may indicate related instability in the handler. Check if Windows path has analogous initialization issues.
4. Reproduce locally by running Controls.DeviceTests on Windows with the HybridWebView test category enabled.

Generated by CI Failure Scanner (net11.0) · 2.1K AIC · ⌖ 24.6 AIC · ⊞ 34.3K · ◷

[SubhikshaSf4851]

I checked the latest CI run in one of the PRs and confirmed that the test category maui-pr-devicetests (net11.0 Windows Helix Tests Run DeviceTests Windows) completed successfully on the Windows platform