Only commenting to say their site makes me mad cause it breaks the browser history. I click the link, go to the fb engineering site, and the back button has no history to go back to HN. Dark Pattern UX -- gross.
Can’t confirm. It works exactly as expected in Firefox (private mode because FB links open in the FB container otherwise), so maybe it’s some extension you have installed? FB Engineering links are usually pretty clean, and they don’t even have a reason to try and keep you there.