@Thirrian the normal file is in there and it appears to have been imported, but theres also a sample, so not really needed to blacklist.
OP has had it happen to at least two of their downloads so some release group must be putting an abc.xyz.mkv sample file in every release.
not much you can do about it really
to be honest im not sure if sonarr is even having an issue with the sample. i would have expected it to not care in the slightest so long as the primary file was in there as well. the import should have succeeded and closed the job?
@cphmichael does sonarr still show those jobs in the activity queue, or are they gone from there?