The upstream source contains a .hg directory. It was most likely included by accident since hg version control directories usually don't belong in releases and may contain a complete copy of the repository. If an upstream release tarball contains .hg directories, you should usually report this as a bug upstream.
The tag is present in Lintian version
That is the most recent version we know about.
We use semantic versions.
The patch number is a commit step indicator relative to the
release tag in our Git
You can find the detection logic for this version at commit ea05801. For merge requests, please use the latest version in the Lintian check files/artifact.