I can’t find it in the dump of Bookogs’ credit roles and I can’t remember ever seeing it, but then again I didn’t learn them off by heart. Here’s the list which I believe is complete: Matching bookogs credit roles to bookbrainz
Just a hunch and that’s why I qualified my statement using the word “suspect”. I thought it might be a case of it being used to credit things like introductions, afterwords, etc., because those roles don’t exist on BB. The other day I submitted an Edition and I wanted to credit the foreword and I almost used blurb but decided that is incorrect.