CodeRabbit and GitHub actions both react to `/ai` command, causing duplicate work

On a PR open by automation (https://github.com/elastic/beats/pull/49621), CodeRabbit left a review comment that was not automatically applied. After issuing the `/ai fix this` command, both CodeRabbit and GitHub Actions reacted to the command independently.

Instead of updating the existing PR, this resulted in CodeRabbit creating a new, separate PR (https://github.com/elastic/beats/pull/49633) with the suggested changes. Meanwhile, github actions also acted on it and fixed the PR inplace.

My expectation is that `/ai` commands issued on a PR should apply changes to that same PR by default. Creating a new PR should only happen when explicitly requested in the prompt, for example when asking to split changes or open a follow-up PR.

Please let me know if this understanding is incorrect.