Why not, right?
I shipped a great bug yesterday. A big thanks to Chris Aldrich for catching that and sending me a DM today to let me know.
With all my cleverness around separating comment types for display below posts, I forgot to check for cases where there was some kind of Webmention, but no regul...
I do like your idea of potentially not showing certain mention types in comment sections. I could see that as a feature that people would appreciate.