While the hns issue is better, personally found I a lot better to not use external geometry at all and instead build my references wrt the base plane. At worst I have to change a sketch attachment, that and doing chamfers absolutely last has saved a ton of grief on some recent models. I hand sketch first, how I learned cad in the first place, that workflow seems to mesh well with it.

Still the odd crash here or there but I’m accepting of it.