I can see from other posts that you're aware of the issue.
I realise that the proper fix is a codebase change, but that PR has been on hold for 3 weeks now.
Posts from kbin.social don't have the problem, but posts from kbin.projectsegfau.lt do. A user there - 'realcaseyrollins' - frequently posts to "Movies & TV", meaning that any feed sorted by New has his posts at the top for at least 2 hours, above any other posts, regardless of when they posted or which Community they was posted to.
He posted earlier today, and I tried to address the problem with him (in this thread and this thread) but without response. He has since posted again tonight, again from the future, automatically above a post that was actually made around the same time.
Whilst he didn't stop posting, he did at one point '@' a Project Segfault admin in response to another Lemmy user's complaint.
That admin replied, but I don't know if they'll actually do anything about it.
Anyway - I'm asking if maybe you can keep an eye on this? If no solution comes from the Project Segfault end, maybe you could provide a temporary fix (via banning or defed'ing for a little while).
I realise I can just ban the user to clear up my own feed, but I was thinking about the casual user and the general Lemmy experience.
Thanks.