The tag is present in Lintian version 2.104.264. That is the most recent version we know about.
The specified file appears to use
to determine the "installed" Python versions.
However, this can cause issues if a Python transition is in progress
-minimal variant of the previous version
python3.X-minimal) remains installed in many environments.
This variant then provides enough of an interpreter to count as being
"installed" but not enough for the tests themselves to succeed in most
cases. This then prevents the overall transition from taking place.
Please replace this will a call to all "supported" packages instead
py3versions -s and ensure
python3-all is listed
in the test dependencies.
Refer to https://lists.debian.org/debian-devel/2020/03/msg00280.html for details.