The latest changelog file for this package specifies a version in the form of 1.2-3+deb8u1, 1.2-3+nmu4 (or similar) but this does not follow from a corresponding 1.2-3 changelog stanza.
This suggests that changes were merged into a single entry. This is suboptimal as it makes it more difficult for users to determine which upload fixed a particular bug.
For more information please consult:
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 ca97c3a. For merge requests, please use the latest version in the Lintian check debian/changelog.