[Seasons] Polar Bear Plunge not working?

Hi, Little context  here. I play with seven day calendar and I moved Winterfest (Christmas) to be on the second day of winter and New Year's Eve on the fourth day. I find this setup more realistic for majority of northern hemisphere, where Christmas is on the beginning of winter not end, as Sims team put it. Right between them I put my own holiday Christmas School Break, which includes modded School Holiday tradition from LittleMsSam, Games and Polar Bear Plunge traditions.

So, I just reached to this day and send my Sims to the pool. But even after four hours in pool this tradition did not mark fulfilled. From previous experiences with this tradition, I know there should be special interaction for this tradition, but somehow, that wasn't the case in this gameplay. I thought it's because of mods, but even after I turned mods off, it still didn't work. One of my Sims got freezing to the point he was blue, but this tradition stays unmarked. I am at a loss. In case it's important, I am in Gibbi Point, which does have cold winters (my Sims are changing into cold weather outfits when going outside) and even snow right now, so, I don't think that should be an issue.

What's wrong with my game?