[stackblitz demo] - custom mdc.config not working

[productdevbook]

https://stackblitz.com/edit/nuxt-starter-4r2kyqek?file=mdc.config.ts

transformers are useless. sometimes they work, sometimes they don't. In one of my projects, it works when I take it at the beginning of the mdc module. In the above example it doesn't add any class either.