It’s annoying, but I’m so far passed this bug at this point that I can’t recall all of relevant details precisely. I ultimately just ended up deleting all of actors after removing their components and started again from scratch (didn’t take long to re-create them with components I had set up). There is definitely some type of problem that occurs with re-parenting under certain conditions though cause I know this isn’t first time engine has crashed while I’ve attempted to re-parent.
All I can clearly recall was sequence of operations that directly lead up to event, but not what I had been doing in general during my programming. It was probably some contextual detail I can’t recall that somehow caused problem. Sorry!