It's annoying when doors, window, decor, etc. disappears, but just simply put it back when you're done doing whatever it was that caused things to vanish. I just had the entire first floor of my build lose all it's windows AND it went from a medium height walls to low height without my wanting or asking for that! Once I raised the walls back up I thought the windows would reappear but no such luck. So I just replaced them, several times. Annoying, but not that bad.