How do I log a bug against a specific snap?

The barrier-kvm snap has a permissions issue. See:

The code maintainer is not the snap maintainer, and in fact doesn’t know who is. In the GitHub issue they ask:

Do you know if there’s a way to report a bug against the snap? I personally don’t know who maintains it.

On the Apple app store and the VS Code Marketplace there is a link to the package publisher, but there doesn’t appear to be anything like that in the Snapcraft Store…

snap info tells you that the snap publisher is “netmag” …
a quick search on launchpad reveals:

there is a “Contact This User” at the top right of the launchpad page that should enable you to contact the snap author.