This may or may not work in your case, but I had a similar thing happen. After I restarted the game, initially they were still frightened, but then in just a second or two went back to acclimatizing.

Also, just a general suggestion, one thing I do at my main base is keep a backup pair of both wolves and boars inside my main structure, well away from anything that might aggro them (especially the wolves, since they will chew their way out) in tiny boxes.

I mostly did this because I wasn't sure about the new Bat event and how they'd handle it with my breeding boxes up on the top floor. (Predictably, the wolves broke out; unpredictably, they died rather easily [even for no-stars].)