I think I saw a note in the last change log about this—apologies if I mis-remembered. Just wanted to say I think it’s still happening, and I just saw what I think is the clearest example.
I’d scrolled to a point where the top few pixels, perhaps the top line of text, was visible on a post at the bottom of the screen. That post contained a link, and as I was looking at the post above the whole feed jumped ‘up’ and the barely visible bottom post was in the view. I guess this fits with what you’d said about that post changing size when its content became available after previous the link.
Hopefully you can find a way for the top of that post on screen to be anchored so the feed moves ‘down’ instead of ‘up’… :)