Locally, that is. It seems like posts are missing from communities that were made before a day or two ago.
EDIT: To be more precise, I can only see posts in local communities that were made up to 4 days ago. I'm experiencing this behavior both with Jerboa and the web UI.
UPDATE: Sorting by Active or Hot is what breaks things. Once changing to sort by New, all community posts show.
No idea if it's relevant in this case but at least once I had to clear both browser cache and the cookies/site data to get Lemmy rendering right after an update.