GitHub connector loses all tools after granting access to a private repository

The GitHub connector becomes unusable after granting access to a private repository.

Repository: https://github.com/ferminquant/fermin-voice-skill

Steps:

1. Connect GitHub in ChatGPT/Codex.
2. Access GitHub successfully.
3. Try to access the private repository above.
4. Grant read access to the repository.
5. Retry GitHub operations.

After permission was granted, every GitHub tool returned:

MCP error -32001: Unknown tool

This affected github.get_repo, github.fetch, github.fetch_file, github.get_profile, and github.create_issue.

Expected behavior:
The connector should refresh its authorization and allow access to the private repository. Existing GitHub tools should continue working.