The upstream source contains a directory used by a bug tracking system. It was most likely included by accident since bug tracking system directories usually don't belong in releases.
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 3410a22. For merge requests, please use the latest version in the Lintian check files/artifact.