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It breaks my usage of having a single instance of global layers. One of the point of global layers was to live out of slides lifecycle. I think maybe we should still keep the original behavior for playback but only duplicates in print mode (I use the --per-slide flag to workaround it in export, btw).

As mentioned in https://sli.dev/custom/global-layers#example, the global layers are used as something like footers. For footers they don't need to be singleton, but should be displayed with each slide. Should we add SlideTop and SlideBottom for footers, while preserving the current usage of global layers? If there are the SlideTop and SlideBottom components, I think the global layers are intended to be used as something like a navigator or so, which should not be printed.