A maintainer upload should have a Debian revision without dots. Revisions with dots are reserved for Non-Maintainer Uploads (NMUs). If you do a maintainer-upload with dots a potential NMU'er has problems choosing a correct version number.
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 nmu.