The version does not comply with the format required for that Debian derivative.
Derivative distributions may enforce additional restrictions on version strings in order to ensure that packages modified specifically for that derivative can be so identified.
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 f5107b6. For merge requests, please use the latest version in the Lintian check fields/version/derivative.