Visit the last post of a very long topic, then scroll up until you see the loading screen; this triggers the bug, including mobile and desktop.
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would there be an Uncaught: in promise error in the browser console
none 
very strange
We’re seeing the same issue on our forum - where if you take a longer topic and start to scroll upwards from the newer posts, eventually it will start jumping up by 20 posts at a time. This has been tested on various browsers, OSs and both mobile and desktop, and with the video from @Teafh it has the same behaviour. We’ve just updated this morning but this was noted a couple of days ago by some users.
do you experience the same behavior in safe mode? that would help rule out theme/plugin issues
Yes, the same in safe mode, both on Meta and my site.
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Correct me if I’m wrong, but this sounds like something that’s been discussed here (see Related, below) which happens because topics are lazy-loaded. When you scroll down from the top, topics pre-load smoothly as you go. But if you’ve jumped to the end, then scroll back up, the earlier topics of various length start loading – and it just looks a bit squirrely as they push everything else down.
@saquetim any ideas here, perhaps this is an edge case in our cloaking removal?