Without me doing anything more, I just went to the Kindle app and now it's showing only 12 books in the Downloaded section. Maybe it thought that 13 was an unlucky number, and decided to delete one on its own.
I suppose there's no need trying to troubleshoot a non-existent Calibre Companion "feature". I guess it was a glitch that the 13 original books (now down to 12!) showed up in the Kindle app at all. Oh well - would have been nice if it was a workable feature.
I think this probably has more to do with the Kindle app than with Companion. I've seen all kinds of complaints online regarding Kindles not displaying side-loaded books. I also saw various proposed solutions, none of which worked for me - things like "use Calibre to convert to MOBI format and set Personal Data Tag from [PDOC] to [EBOK]" - something like that. Didn't work. Stupid Kindle must think people only use Amazon's ecosystem, and not use infinitely better software like Calibre.
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