TL;DR: "Load more" behaviour is inconsistent in the latest builds.
I have my feed set to "Oldest first". So when I fire up Tusky, I'm taken to where I left off. I scroll upwards through the feed, reading newer messages. Eventually I come to a "Load more" bar. I click on it.
Previously, new messages were loaded ABOVE the bar, so the last message I had read (below the bar) was still on screen with the newly-loaded ones above. I could continue as normal.
Now, the new messages are sometimes loaded BELOW the bar. So, in effect, I've been skipped forward. The last message I read is now some way down my feed and I have to scroll back down to (try to) find it so I can continue where I left off.
This doesn't happen every time and I've been trying to find a pattern. I think, though I'm not completely sure, that if "Load more" doesn't load all of the missing messages (so the bar stays there ready to load another batch) the messages get loaded below. But if it is able to load all missing messages, it loads them above.
Hope that all makes sense.