Docs sometimes need a refresh for them to reappear. We’re not sure why, but we’ll migrate to a different system soonish hopefully anyway. That’s for recordings anyway, the question is for tracks.
Not everything is based on explicit guidelines, sometimes we edit based on common sense and what editors mostly agree on. This is one of those cases, unless I’m misremembering and we explicitly say it somewhere. It’s a similar reasoning to why the guess titles code automatically removes “(bonus track)” - it’s useless.