Make Nuxt use $development variables on Vercel

Hi everyone,

Maybe a stupid question, but I can't make Nuxt use $development variables (nuxt-config.ts) on Vercel preview deployments.

For instance, I have a dev.MY_DOMAIN that is linked to my dev branch.
Locally, it works perfectly. Nuxt uses the correct variables if I'm in development.

But on Vercel, it still uses my production variables.

I tried setting NODE_ENV etc... but nothings seems to be working.
Any idea?
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