[Windows][26.908.9136.0] Codex window closes when pressing period / Russian ю key

Codex App version

Windows MSIX package OpenAI.Codex 26.908.9136.0.

Platform

Windows 11 Home, build 26200, x64.

Issue

The user reports that the Codex desktop app abruptly closes when pressing the physical key that types . in the English layout and ю in the Russian layout. Both characters are produced by the same physical keyboard key. This has happened repeatedly while using Codex. The window disappears and the app has to be opened again.

Steps to reproduce

1. Open Codex Desktop on Windows and focus its main window.
2. With an English keyboard layout, press the period key; alternatively, switch to the Russian layout and press the same physical key to type ю.
3. Observe that the Codex window closes unexpectedly.

The user's report establishes the repeated trigger. I have not run an automated key injection against the current live Codex session, so the exact focused control and whether both layouts behave identically in every task still need confirmation.

Expected / actual

The app should accept the character and stay open. Instead, the entire Codex window closes.

Local diagnostic observations

• Several new desktop log instances appeared between approximately 23:12 and 00:04 PDT on September 14–15, 2026, consistent with repeated restarts.
• The instance ending around 00:04 PDT logged 111 occurrences of ResizeObserver loop completed with undelivered notifications. in the primary renderer. This is a correlation, not an established cause of the close. A possibly related layout-loop report is #39419.
• No contemporaneous Windows Application Error / Windows Error Reporting event for ChatGPT.exe was found in the last two hours, and no recent Crashpad .dmp was present in the app's report directory. The app log ends without a clear fatal exception or explicit quit reason.
• PowerToys Keyboard Manager has no configured key or shortcut remaps; no Windows Scancode Map was found.

Raw logs are omitted because this session's desktop logs contain sensitive OAuth callback data. Please advise what additional sanitized trace would best distinguish an application exit from a renderer or keyboard-input failure.

Start by reproducing the issue on Windows 11 with the English period key and Russian ю key, then inspect sanitized desktop logs to distinguish an application exit from a renderer or keyboard-input failure. Compare the findings with the possibly related layout-loop report #39419; done means both characters are accepted without the Codex window closing.