In pm.stackexchange.com, Looking at the related links below they look like normal text and not distinct as links. They are not underlined when mouse hover. Am using Google chrome browser, I don't think it is my browser.
Just asked some other mods. It seems to be a known behaviour for all beta sites. Will check if there's further info on it, and if it's categorized as a bug or not.
Edit: As I haven't had an answer from other mods if that's an expected behaviour or not, I raised this question @ meta.stackoverflow: Related Questions/Linked Questions on Stack Exchange beta sites not appearing as links when hovered