macOS app: colored emoji invisible and feedback returns no-active-thread

Environment

• Platform: macOS
• ChatGPT desktop app: [version from screenshot]
• macOS: [version from screenshot]
• Web version: same conversation renders correctly on chatgpt.com

Primary issue
Colored emoji such as 🟢 ⚪ 🔴 are invisible in the ChatGPT macOS app. This affects normal assistant text and code blocks. The same conversation renders correctly on the web.
Secondary issue while reporting the bug
When I submit in-app feedback from the affected conversation with “Include this ChatGPT conversation and diagnostic logs” enabled, the feedback ID is no-active-thread-... instead of a session UUID.
App logs repeatedly show conversation_inaccessible with HTTP 404 on /conversation/init, even though:

• I am signed in
• the conversation appears in the sidebar/history
• the same conversation opens normally on chatgpt.com under the same workspace
  Troubleshooting already tried
• Fully quit and relaunched the macOS app
• Submitted feedback from the affected thread
• Confirmed the conversation opens on web
• Checked app logs
  Expected behavior
• Colored emoji should render normally in the macOS app
• Feedback from an existing chat should attach the thread and return a session ID
  Actual behavior
• Emoji are invisible
• Feedback returns no-active-thread
• Logs show conversation_inaccessible on /conversation/init

2026-09-17T08:28:34.818Z info [browser-session-registry] IAB_LIFECYCLE rebound browser sidebar window ownerWebContentsId=1 previousOwnerWebContentsId=1 windowId=1
2026-09-17T08:28:34.841Z warning [electron-message-handler] sa_server_request_failed attachAuth=true attachIntegrityState=true errorCode=conversation_inaccessible errorMessage="{"detail":{"message":"You don’t have access to this conversation. Make sure you’re logged in to the right account, or ask the conversation owner to send you a share link.","code":"conversation_inaccessible","can_retry":false,"conversation_id":"6aaba143-ca44-83e8-9ec2-775ca26f4fba"}}" errorName=Error errorStack="Error: {"detail":{"message":"You don’t have access to this conversation. Make sure you’re logged in to the right account, or ask the conversation owner to send you a share link.","code":"conversation_inaccessible","can_retry":false,"conversation_id":"6aaba143-ca44-83e8-9ec2-775ca26f4fba"}}" hasRequestBody=true method=post rendererWebContentsId=1 rendererWindowAppearance=primary rendererWindowFocused=true rendererWindowId=1 rendererWindowVisible=true requestHeaderNames=["OAI-Language","X-OpenAI-Attach-Auth","X-OpenAI-Attach-Desktop-Surface","X-OpenAI-Attach-Integrity-State","oai-did","x-openai-codex-window-type","x-openai-web-frontend"] routePattern=/conversation/init status=404 url=/conversation/init
2026-09-17T08:28:34.943Z info [electron-message-handler] chatgpt_conversation_refetch_completed asyncStatus=null conversationId=6aaba143-ca44-83e8-9ec2-775ca26f4fba currentNodeApplied=true mappingSize=23 reason=missed_messages rendererWebContentsId=1 rendererWindowAppearance=primary rendererWindowFocused=true rendererWindowId=1 rendererWindowVisible=true snapshotMappingSize=23 statusAfter=idle statusBefore=idle

Screenshots

1. Emoji rendering issue in ChatGPT macOS app — colored emoji are invisible.

2. macOS version.

3. ChatGPT macOS app version.

No source files or tests are identified. Start by reproducing colored emoji and code-block rendering in the macOS app, then trace the feedback flow and the logged /conversation/init request; done means emoji render normally and feedback from an existing conversation returns a session ID without conversation_inaccessible.