The tag is present in Lintian version 2.109.24. That is the most recent version we know about.
The packaging includes a detached upstream signature file that contains
spurious fields like
Version:. They are
sometimes added by
gpg --enarmor, especially if you have an older
version. Modern versions only add a
Please generate the signature with
gpg --armor --detach-sig using a
modern version instead.