I’ve created some stories and set them as public. They show up as expected when I look at the pages using an incognito browser.
However, I’ve made a couple of “community posts” public and they are not visible to the public, or to accounts that have signed up and clicked the follow button.
The community forum posts should be really visible on the author page. All posts should be shown like the stories where you can see them, but if you are not high enough level you cannot read them.