The plain-Jinja fast path in generate_chat_stream renders the template
itself and generates via create_completion — which never invokes the
multimodal (mmproj) chat handler, so image_url parts were silently
dropped and vision models answered as if no image was sent. Streaming
vision requests now fall through to create_chat_completion.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014S8VtAvG499SsCbeESRK7V