This is a fairly persistent issue that appears to be exclusive to Connect, and extremely annoying.
Any time a post accumulates very large numbers of comments (say, 300 or more), Connect will eventually just… stop loading additional comments. At first, scrolling down will load a few more top-level comments, but eventually it’ll just give up and act like there’s no more comments to load, even though there Connect has loaded less than 50 comments out of a 1,000+ comment megathread. Worse yet, if a user direct links to a comment on one of those megathreads, Connect will load a completely empty comment thread. This issue doesn’t occur on Voyager or Jerboa, nor on the web UI.
It used to be persistent, but it’s actually stopped happening the past few days–for example, I just loaded a 900-comment post. Previously, it would give up and stop loading new top-level comments after the 3rd or 4th batch (for a grand total of roughly 30-40 comments), but today it loaded several hundred comments without issue.
I don’t know if it’s a recent change to the app, an update to my Lemmy instance, or something else. I’ll keep monitoring, and update this post if it starts happening again.