I think that the root of the problem is that the entry in the plugin index for MobiUnpack points to the thread for KindleUnpack. That didn't used to matter, but the change in new version of calibre causes it to treat MobiUnpack and KindleUnpack as being identical because of this link. That combined with an instruction in the KindleUnpack entry to remove MobiUnpack results in KindleUnpack being marked for removal instead.
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