The tag is present in Lintian version 2.104.328. That is the most recent version we know about.
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.