@media_dept I find copying or duplicating in Godot can be hit or miss. Some things are referenced across files in ways you wouldn't expect unless you open up the tscn file and check manually. Animations are a big offender I don't think people realize, though most people I think know about resource sharing and having to make them unique.
Signals can get annoying just in general, which is why I usually connect them via code only, so I know exactly where they are going.