Replies rendered as code; API logs show invalid image_url payload Environment

[aguanitallc]

• VS Code + Codex extension (latest pre-release)
• macOS (Sequoia and OS 26)

Steps to Reproduce

1. Open Codex chat and send any plain-text prompt (no code fences).
2. Observe the response in the chat UI.
3. Open the Codex output/log panel.

Observed Result

The reply shows up formatted as a code block.
Log output repeats:

stream error: unexpected status 400 Bad Request: { "error": { "message": "Invalid 'input[112].content[0].image_url'. Expected a base64-encoded data URL with an image MIME type (e.g. 'data:image/png;base64,aW1nIGJ5dGVzIGhlcmU='), but got unsupported MIME type 'text/plain'.", "type": "invalid_request_error", "param": "input[112].content[0].image_url", "code": "invalid_value" } }

Expected Result

• Chat replies render as normal text.
• No repeated 400 errors about image_url.

Extra Info

• Every message I send is plain text.
• Issue happens consistently.
• Reopening VS Code doesn’t help