Anybody else with same problem?

I had a bit of a search for discourse and thread scrolling issues, there seems to be a few instances but all I have seen are posts from a few years previous.

For instance

Scroll jank when scrolling up - Feature - Discourse Meta

That made me aware you can use safe mode -

https://www.trucknetuk.com/safe-mode

For me that seems to behave for a few threads I’ve tried so far.