Alright, I am decided to code my own physics for constrained objects. With blackjack and better control. I am going to apply signed float value of impulse via interface and then apply movement and reduce it by stiffness value while looking on constraint values every tick. Or something like this. I did not find a way to make constraints work as they did in UE4 and UE5 EA versions. And I found out you need to pay to talk about it with UE developers. And I did not found issue in a current issues list.