See Auto-lock topics after X days? for example. If you click “post #5” (and perhaps if you have open external links in new window set in your user profile) it open in a new tab.
That seems like a 
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9 Likes
Fixed via:
https://github.com/discourse/discourse-solved/commit/54379204f335277bfad4e846bd462131b22acdf9
Thanks for bringing this to our notice @pfaffman. 
5 Likes