I was reading comments on another post that were talking about issues regarding pulling in the post/comment history of a community on another instance prior to a user subscribing to the community on their own "home" instance.
I think I have managed to subscribe to a boardgame community that is hosted on !boardgames feddit.de- I can’t see the comments and such when viewing from here as well.
You should be able to click on the link in your "Subscribed" panel on the right of the page to go to the specific community page. Your browser URL bar and the page header should still show that you are on sh.itjust.works, since you are indeed still here. On the backend, the sh.itjust.works server is talking to the feddit.de server and saying "Hey, I have a user that wants to see content from this boardgame community you have. Can you send me any new posts for that community?".
Here's where I get fuzzy. I am under the impression that while posts themselves will federate from the main instance to the database for this instance, until someone here interacts with them, meaning they upvote, downvote, or comment on it, comments won't propagate? I might be completely wrong here though.
If I'm wrong about any of this please let me know!