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.

Welp, I spoke too soon. Happens on this post: https://lemm.ee/post/4849090

Curiously, it seems that if I constantly scroll down and keep immediately loading comments, it seems to work. But if I stop and actually read, once I reach the bottom it won't load any more.

Side note, some feedback in the UI regarding what's going on would be helpful--a little pop-up or loading icon when it loads more comments.