In the appearance panel, I only see a single stroke and fill property when I select multiple objects or layers:
This is the case, despite both objects sharing the exact same appearance:
This also means that if I go to the appearance panel and duplicate the stroke, the duplicated stroke is applied to all objects and I am not able to see this in the panel itself! That shouldn't be the case.
Hopefully, this will be addressed together with a feature request of mine, which is to apply an appearance a layer: