As @Mittineague said in the other topic:
Post links also do not open in a new tab from a user’s profile page. Go to this post: Search within topic is omitting results and click the first link, which will open in a new tab as expected.
Now go to my profile page, find that post and click the link. It opens in the same tab.
(I have no idea whether or not this is considered a bug; I’m simply reporting facts.)