That is working as expected. Calibre updates the book with the latest version of the metadata when sending the book. But, it needs to know how to do this. epubs are fully supported. But, calibre doesn't include plugins to write the metadata to kepub or CBZ formats. For kepubs, you need the Kepub Metadata Writer plugin. For CBZ, I think you need Embed Comic Metadata.
The other side of this is the ereader. Kobo ereaders will get the metadata from epubs and kepubs. But, I don't think they read CBR or CBZ.
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