$ apt-cache policy light-themes light-themes: Installato: 16.10+18.04.20181004-0ubuntu1 Candidato: 16.10+18.04.20181004-0ubuntu1
I confirm this is fixed in bionic-proposed.
$ apt-cache policy light-themes 04.20181004- 0ubuntu1 04.20181004- 0ubuntu1
light-themes:
Installato: 16.10+18.
Candidato: 16.10+18.
I confirm this is fixed in bionic-proposed.