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.
@froodloop
I’m not sure if the link text has to be correct for the mention. When you select from the dropdown box on lemmy it comes out with @user@instance in the link text.
Also I edited my comment above to include instance agnostic links. Unfortunately they don’t deliver mention notifications.