Over and over again, especially when I'm using Auto-Animate to mimic a modal view, when I have the above layer "slide" outside the artboard, it then suddenly becomes attached to a near adjacent artboard. It's EXTREMELY annoying.

Maybe there needs to be a built in "margin" outside an artboard, that keeps slightly outside elements still as part of it? Or, a way to manually assign an off-artboard element to a specific artboard.