The tag is present in Lintian version 2.114.55. 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 8053610. For merge requests, please use the latest version in the Lintian check menu-format.
The desktop entry lists support for at least one mime type, but does not provide codes like %f, %F, %u or %U for the Exec key.
If the application can indeed handle files of the listed mime types, it should specify a way to pass the filenames as parameters.