People play really straightforward it seems so I would think that if they a set they would just reraise the flop. So, the only thing that made sense for me would be if they had some sort of straight draw, although I guess they could have TT34 or like 5432 but that's pretty rare and most don't even raise the 2nd hand.
And this is like the bottom of my 3betting range. Double suited jacks with a nut flush draw, I figure I can't be in terrible shape. IDK I'm a PLO
though.
3betting range is probably good rundown hands and high pairs double suited. I don't 3bet AAxx badugi unless I can get 1/3 of my stack in pre.