There is a file in the package whose name matches the format NFS uses to temporarily save files that were deleted while another process had them open. It may have been included in the package by accident while building the package in an NFS filesystem.
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 files/unwanted.