Windows desktop 26.903.8094.0: browser-process crash during remote work, shortly after IAB tab cleanup

Environment

Windows x64; Microsoft Store package OpenAI.Codex 26.903.8094.0 (display name ChatGPT).

Problem

The app exited during remote work and the host became unreachable through the app. The laptop lid had been closed; whether this caused the crash is unknown. The app was reopened about three minutes later.

Evidence

• Main app log stopped at 2026-09-09 23:41:24.676 UTC.
• A Crashpad sidecar was written about one second later with capture_kind=crash, osarch=x86_64, ptype=browser.
• The last events involved disposal and closure of an IAB browser sidebar tab, followed by runtime dependency diagnosis completing with installed=true and problemCount=0.
• No sleep or reboot event was found near the interruption. Both AC and battery lid actions were set to do nothing.
• Reopening did not change the package version.

Expected

An awake host remains reachable, and disposing an internal browser tab does not terminate the app.

Limitations

This is one incident without a confirmed reproduction sequence or crash stack. The browser cleanup and lid closure are correlations, not established causes.

Start with the main app log ending at 2026-09-09 23:41:24.676 UTC and the Crashpad sidecar showing ptype=browser, then correlate the IAB tab disposal events with the runtime dependency diagnosis. Done means establishing a reproducible trigger or an actionable crash diagnosis; the report currently provides neither a stack nor a reproduction sequence.