@codinghorror I think I just realized why this is happening. We do have a category on our forum that is restricted to a special group of paying users on our main site. Anonymous / “normal” logged in users can’t access this category.
I’m going to guess that if a single topic in that special category contains some large number of the most recent posts to the site, then they’re simply omitted from the posts.json endpoint for anonymous users. And thus, we exceed whatever the behind-the-scenes limit is for that endpoint. So we end up getting the truncated list that I’m seeing in this specific moment in time when requesting that feed anonymously.
Am I on to something here?
This is probably an edge case. But does it make sense to make a feature request for that endpoint so that it always returns the X number of most recent posts, relevant to whatever level of permissions the request is being made from?