The upstream source contains a file that looks like a Subversion conflict file. These are generated by Subversion when a conflict was detected while merging local changes with updates from a source repository. They're useful only while resolving the conflict and were probably included by accident. You may want to report this as an upstream bug.
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 d219a5a. For merge requests, please use the latest version in the Lintian check cruft.