Just now, loading the page https://lemmy.world, I saw a different user’s main page. The page loaded in light mode (I use dark) with the username of /u/froodloop in the top right. Then a moment later, it refreshed into my expected main page with my username in top right. This went past too quickly to get a screenshot, but it was reminiscent of some of the bugs that were happening in the old websocket code.
Out of curiosity, do you recall the other username, and was it close to yours in the alphabet?
I noticed that froodloop is alphabetically close to fubo, and wondered if that had anything to do with this bug.
Unfortunately, I can’t recall the username. It was just enough time for me to understand that something was wrong with the page, and in a moment, it switched to my account.