We use git, we found last commit which is correct. Then we have 6 commits in those we didn’t change this class, its parent, childs, child components. Now we are working in other part of project. we’ve found that something wrong with references, If we delete one class which only casts our broken blueprint, it starts to work sometimes. Some unexpected behavior inside all of this happens. Can it happen because of some cyclic referencing in classes? Also, we have one mesh that causes problem, due to its wrong import from other project and it has null references to its precious project, we also considering this as possible cause.