I’ve seen this issue before. My All feed will only continue to load additional posts like twice, for a total of 75-ish posts and then says “I’ve found the bottom” or whatever. This was on my lemmy.world account. I haven’t investigated other instances yet. I’ve closed and restarted the app, still had the same behavior. I have yet to log out and back in.
The Local feed pulls one or two more “groups” of posts, but Subscribed performs like the All feed. The sort by old is the only sort mode that continually pulls posts (apparently), otherwise, the new/hot/scaled/etc. still stop after x number of posts.