GitHub code review posts multiple "model is not available" comments even though review succeeds

Description

When I trigger a Codex/Copilot code review on a GitHub pull request, the review is completed successfully, but the bot often posts around 5–6 additional comments with the following error:

The model is not available for your account. This can happen if the model was disabled by your organization's policy or if your Copilot plan doesn't include access to it. You can try again without specifying a model (just @copilot) to use the default, or choose a different model from the model picker. If you want to contact GitHub about this error, please mention the following identifier so they can better serve you: 17cce801-4748-4e16-b889-a747957d0dd8

Despite these errors, the actual review is still generated and posted.

Expected behavior

A successful review should not produce repeated error comments. If one internal model attempt fails and the system falls back to another model, that failure should either be handled silently or reported once in a consolidated status message.

Actual behavior

• The review completes successfully.
• Approximately 5–6 identical or near-identical error comments are added to the pull request.
• The comments make it appear that the review failed, even though it did not.

Reproduction

1. Open a pull request on GitHub.
2. Request a Codex/Copilot review.
3. Wait for the review to complete.
4. Observe multiple comments stating that the model is unavailable, while the review itself is still posted successfully.

Additional context

This happens repeatedly rather than as a one-off occurrence. The visible GitHub account in the error comments is Krzysztof318.