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calibre listens on all ipv6 and ipv4 interfaces by default. This change happened about a year ago in version 7.2.0, not version 7.20. Listening on ipv6 does not mean it doesnt listen on ipv4. And calibre has always had a setting to control which interfaces the content erver listens on, Preferences->Sharing over the net->Advanced->The interface to listen on for connections. Change it to 0.0.0.0 if you only want to listen on IPv4 only. And incidentally the kernel of your machine is advertising ipv6 capabilities regardless whether you configured it to or not.
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