Evgeny, yes, I thought that would be the problem. I have been using permalinks like that ever since I started using Hugo back in 2016. It's messier than it might first appear, because as you can see from this 'snip' of my
config.toml only some content is laid out that way.
[permalinks] blog = "/blog/:year/:month/:day/:slug/" notes = "/notes/:year/:month:/:day/:slug/" mentions = "/mentions/:year/:month:/:day/:slug/" resources = "/resources/:slug/" pages = "/pages/:slug/"
I suppose, it would be easy enough for me,
sed to move to a directory structure like yours (fixing up any relref on the way). Then, the structure 'on-disk' of all my content would be consistent across all the sections (blog, notes, mentions, etc.) with how it is presented on the web.
This all makes me think my architecture of webmentions/IndieWeb isn't right in my head yet. These 'mentions' on my side aren't being threaded back to the original post. I'll have to sort that — and then come back and fix-up these somewhat broken mentions.
What I think I will do—for mentions like this—is put a couple of links in my front matter. One for the original source, and maybe one for the mention my mention is responding to. Then I'll have the template spew out the correct URLs. I guess that's how you and others do it. Arrg, I need to go back to IndieWeb and see how its meant to be done.