Windows app: Copy button content intermittently cannot be pasted after switching chats

Codex App version

26.727.6591.0

Platform

Windows x64

Issue

Content copied with the in-chat Copy button can be pasted while remaining in the current chat, but after switching to another chat it intermittently cannot be pasted into that chat's composer.

This appears to be a cross-chat clipboard or composer-focus bug. The copy action itself appears successful in the source chat, but the clipboard content is not reliably available after navigating to a different chat.

Steps to reproduce

1. Open chat A in the Codex Windows app.
2. Click the Copy button on content in chat A.
3. Confirm that pasting works while still in chat A.
4. Navigate to chat B.
5. Focus chat B's composer and press Ctrl+V.

Observed behavior

The copied content intermittently does not appear after switching chats.

Expected behavior

Content copied with the in-chat Copy button should remain on the Windows clipboard and paste reliably into the composer of any other chat after navigation.

Additional notes

• Reproduced by the user during normal multi-chat use.
• This report intentionally excludes chat content, local file paths, and private workspace data.