I don’t think I ever upgraded nbdev during the entire time I was using the blog. That could well be the case. Didn’t realise I had to.
Also make sure you are using the latest pre-release of quarto Quarto - Release Candidate Builds
Seems like I’m on 2.3.7 of nbdev.
latest is 2.3.10 nbdev/settings.ini at master · fastai/nbdev · GitHub