This package contains a program in $PATH and is named libapp-*-perl which usually implies that the upstream project on CPAN is under the App:: hierarchy for applications. Instead of libfoo-bar-perl it should be named foo-bar.
People tend to skip library-like named packages when looking for applications in the package list and hence wouldn't notice this package.
For more information please consult:
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 fd97859. For merge requests, please use the latest version in the Lintian check application-not-library.