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Original (grouped object).
Hiding individual layers results in parts of the object to become hidden (according to which layer is hidden).
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Copied object (on “Layout” layer).
Hiding individual layers does nothing, except hiding “Layout” layer which makes whole object disappear. Sub-objects do not keep their layer attribution!
Test it yourself by selecting the original object and copying it (Ctrl-C, Ctrl-V) to any other layer.