The source tarball contains a prebuilt Python object. They are usually left by mistake when generating the tarball by not cleaning the source directory first. You may want to report this as an upstream bug, in case there is no sign that this was intended.
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 c1c05b0. For merge requests, please use the latest version in the Lintian check files/source-missing.