Often we have to update or add new layers to existing story map maps.
As of now, when a new layer is added to a web map, it is defaulted to be hidden in all story map instances of that map despite it being visible in the web map's set-up. In my case now, I had one web map feeding a storymap 20 times (6 web map views with 14 media action map views). Since I had to overwrite this layer twice, I had to unhide this layer 40 times. This is not the first time I am running into this nuisance.
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Above is the new layer being automatically hidden in the storymap map view layer settings.
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There could be an option in the story map view options to Hide New Layers that could be defaulted to be disabled.