Hi Jonathan, it seems you uploaded debian-junior 1.28 but did not pushed the latest commits (changelog says "UNRELEASED"). Please push to make sure we have the full history.
I'm in the process of recreating the dependencies of the metapackages to reflect the status of what is released in Buster. May be some package was removed from testing in the freeze process and should not be recommended by a metapackage. Kind regards Andreas. -- http://fam-tille.de