Bug Horizontal layout not initializing

So I have this generated timeline where I instantiate game objects. They're generated in horizontal layout group but they get in order only when I alt+tab unity window, or if I try to move one item manually (then the rest of the items glitch out a little bit but they get in order eventually). I've done some research and tried Canvas.ForceUpdateCanvases and also tried things from this thread. None of this helped. Is this a known Unity bug or am I doing something stupidly wrong? I tried generating items using coroutines and tried to move the whole container with DOTween DoMoveX but that also didn't work. Any ideas on how I could fix this problem? Thanks

 

So I fixed the problem by changing the value of horizontal layout group like this:

Code (CSharp):

1.             yield return new WaitForEndOfFrame();
2.             _yearSectorContainerTR.GetComponent<HorizontalLayoutGroup>().spacing = 251f;
3.             yield return new WaitForEndOfFrame();
4.             _yearSectorContainerTR.GetComponent<HorizontalLayoutGroup>().spacing = 250f;

But I believe this is not the only solution to this problem...