Because KCC does not, actually, generate KePubs, it just renames the epub to get it to be opened by the KePub renderer instead of ADE, but it doesn't actually enable any of the KePub features.
Run the file through kepubify or the appropriate Calibre plugin instead.
Sidebar: if this is pure image content, you'll be better of with a CBZ (which... I think are supported natively by Nickel? [Don't quote me on that ;p]).
Last edited by NiLuJe; 10-02-2022 at 08:53 PM.
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