Duo adds triple backticks to autocomplete suggestions

Checklist

• I'm using the latest version of the extension (see the latest version in the right column of this page)
  • Extension version: 6.38.1
• I'm using the latest VS Code version (find the latest version here)
  • VS Code version: 1.103.2
• I'm using a supported version of GitLab (see README for the supported version)
  • GitLab version: v18.2.1-ee

Summary

When editing Python files using Duo, configured to use OpenAI GPT-4o via the AI Gateway, autocomplete adds triple backticks to its suggestions (almost as though it thinks it's editing a markdown file).

This is on a self-hosted Gitlab instance. The model is configured as a self-hosted model, as follows:

• Platform: API
• Model family: GPT
• Endpoint: https://api.openai.com/v1
• Model identifier: openai/gpt-4o

Steps to reproduce

Open a .py file, start typing code, wait for Duo autocomplete to provide a suggestion.

What is the current bug behavior?

The suggestion comes wrapped in triple backticks.

What is the expected correct behavior?

The suggestion should be provided without backticks.

Relevant logs and/or screenshots

Possible fixes